diff --git a/action_processor.cc b/action_processor.cc
index 0d8c046..d4e5cc4 100644
--- a/action_processor.cc
+++ b/action_processor.cc
@@ -54,7 +54,7 @@
 }
 
 void ActionProcessor::ActionComplete(AbstractAction* actionptr,
-                                     ActionExitCode code) {
+                                     ErrorCode code) {
   CHECK_EQ(actionptr, current_action_);
   if (delegate_)
     delegate_->ActionCompleted(this, actionptr, code);
@@ -64,7 +64,7 @@
   if (actions_.empty()) {
     LOG(INFO) << "ActionProcessor::ActionComplete: finished last action of"
                  " type " << old_type;
-  } else if (code != kActionCodeSuccess) {
+  } else if (code != kErrorCodeSuccess) {
     LOG(INFO) << "ActionProcessor::ActionComplete: " << old_type
               << " action failed. Aborting processing.";
     actions_.clear();
diff --git a/action_processor.h b/action_processor.h
index 38d63ae..696afd4 100644
--- a/action_processor.h
+++ b/action_processor.h
@@ -9,6 +9,8 @@
 
 #include "base/basictypes.h"
 
+#include "update_engine/error_code.h"
+
 // The structure of these classes (Action, ActionPipe, ActionProcessor, etc.)
 // is based on the KSAction* classes from the Google Update Engine code at
 // http://code.google.com/p/update-engine/ . The author of this file sends
@@ -21,101 +23,6 @@
 
 namespace chromeos_update_engine {
 
-// Action exit codes.
-enum ActionExitCode {
-  kActionCodeSuccess = 0,
-  kActionCodeError = 1,
-  kActionCodeOmahaRequestError = 2,
-  kActionCodeOmahaResponseHandlerError = 3,
-  kActionCodeFilesystemCopierError = 4,
-  kActionCodePostinstallRunnerError = 5,
-  kActionCodeSetBootableFlagError = 6,  // TODO(petkov): Unused. Recycle?
-  kActionCodeInstallDeviceOpenError = 7,
-  kActionCodeKernelDeviceOpenError = 8,
-  kActionCodeDownloadTransferError = 9,
-  kActionCodePayloadHashMismatchError = 10,
-  kActionCodePayloadSizeMismatchError = 11,
-  kActionCodeDownloadPayloadVerificationError = 12,
-  kActionCodeDownloadNewPartitionInfoError = 13,
-  kActionCodeDownloadWriteError = 14,
-  kActionCodeNewRootfsVerificationError = 15,
-  kActionCodeNewKernelVerificationError = 16,
-  kActionCodeSignedDeltaPayloadExpectedError = 17,
-  kActionCodeDownloadPayloadPubKeyVerificationError = 18,
-  kActionCodePostinstallBootedFromFirmwareB = 19,
-  kActionCodeDownloadStateInitializationError = 20,
-  kActionCodeDownloadInvalidMetadataMagicString = 21,
-  kActionCodeDownloadSignatureMissingInManifest = 22,
-  kActionCodeDownloadManifestParseError = 23,
-  kActionCodeDownloadMetadataSignatureError = 24,
-  kActionCodeDownloadMetadataSignatureVerificationError = 25,
-  kActionCodeDownloadMetadataSignatureMismatch = 26,
-  kActionCodeDownloadOperationHashVerificationError = 27,
-  kActionCodeDownloadOperationExecutionError = 28,
-  kActionCodeDownloadOperationHashMismatch = 29,
-  kActionCodeOmahaRequestEmptyResponseError = 30,
-  kActionCodeOmahaRequestXMLParseError = 31,
-  kActionCodeDownloadInvalidMetadataSize = 32,
-  kActionCodeDownloadInvalidMetadataSignature = 33,
-  kActionCodeOmahaResponseInvalid = 34,
-  kActionCodeOmahaUpdateIgnoredPerPolicy = 35,
-  kActionCodeOmahaUpdateDeferredPerPolicy = 36,
-  kActionCodeOmahaErrorInHTTPResponse = 37,
-  kActionCodeDownloadOperationHashMissingError = 38,
-  kActionCodeDownloadMetadataSignatureMissingError = 39,
-  kActionCodeOmahaUpdateDeferredForBackoff = 40,
-  kActionCodePostinstallPowerwashError = 41,
-  kActionCodeUpdateCanceledByChannelChange = 42,
-
-  // Note: When adding new error codes, please remember to add the
-  // error into one of the buckets in PayloadState::UpdateFailed method so
-  // that the retries across URLs and the payload backoff mechanism work
-  // correctly for those new error codes.
-
-  // Any code above this is sent to both Omaha and UMA as-is, except
-  // kActionCodeOmahaErrorInHTTPResponse (see error code 2000 for more details).
-  // Codes/flags below this line is sent only to Omaha and not to UMA.
-
-  // kActionCodeUmaReportedMax is not an error code per se, it's just the count
-  // of the number of enums above.  Add any new errors above this line if you
-  // want them to show up on UMA. Stuff below this line will not be sent to UMA
-  // but is used for other errors that are sent to Omaha. We don't assign any
-  // particular value for this enum so that it's just one more than the last
-  // one above and thus always represents the correct count of UMA metrics
-  // buckets, even when new enums are added above this line in future. See
-  // utils::SendErrorCodeToUma on how this enum is used.
-  kActionCodeUmaReportedMax,
-
-  // use the 2xxx range to encode HTTP errors. These errors are available in
-  // Dremel with the individual granularity. But for UMA purposes, all these
-  // errors are aggregated into one: kActionCodeOmahaErrorInHTTPResponse.
-  kActionCodeOmahaRequestHTTPResponseBase = 2000,  // + HTTP response code
-
-  // TODO(jaysri): Move out all the bit masks into separate constants
-  // outside the enum as part of fixing bug 34369.
-  // Bit flags. Remember to update the mask below for new bits.
-
-  // Set if boot mode not normal.
-  kActionCodeDevModeFlag        = 1 << 31,
-
-  // Set if resuming an interruped update.
-  kActionCodeResumedFlag         = 1 << 30,
-
-  // Set if using a dev/test image as opposed to an MP-signed image.
-  kActionCodeTestImageFlag       = 1 << 29,
-
-  // Set if using devserver or Omaha sandbox (using crosh autest).
-  kActionCodeTestOmahaUrlFlag    = 1 << 28,
-
-  // Mask that indicates bit positions that are used to indicate special flags
-  // that are embedded in the error code to provide additional context about
-  // the system in which the error was encountered.
-  kSpecialFlags = (kActionCodeDevModeFlag |
-                   kActionCodeResumedFlag |
-                   kActionCodeTestImageFlag |
-                   kActionCodeTestOmahaUrlFlag)
-};
-
 class AbstractAction;
 class ActionProcessorDelegate;
 
@@ -153,7 +60,7 @@
   }
 
   // Called by an action to notify processor that it's done. Caller passes self.
-  void ActionComplete(AbstractAction* actionptr, ActionExitCode code);
+  void ActionComplete(AbstractAction* actionptr, ErrorCode code);
 
  private:
   // Actions that have not yet begun processing, in the order in which
@@ -177,7 +84,7 @@
   // to the ActionProcessor is passed. |code| is set to the exit code of the
   // last completed action.
   virtual void ProcessingDone(const ActionProcessor* processor,
-                              ActionExitCode code) {}
+                              ErrorCode code) {}
 
   // Called when processing has stopped. Does not mean that all Actions have
   // completed. If/when all Actions complete, ProcessingDone() will be called.
@@ -187,7 +94,7 @@
   // or otherwise.
   virtual void ActionCompleted(ActionProcessor* processor,
                                AbstractAction* action,
-                               ActionExitCode code) {}
+                               ErrorCode code) {}
 };
 
 }  // namespace chromeos_update_engine
diff --git a/action_processor_unittest.cc b/action_processor_unittest.cc
index 20a79af..20bded6 100644
--- a/action_processor_unittest.cc
+++ b/action_processor_unittest.cc
@@ -33,7 +33,7 @@
   void PerformAction() {}
   void CompleteAction() {
     ASSERT_TRUE(processor());
-    processor()->ActionComplete(this, kActionCodeSuccess);
+    processor()->ActionComplete(this, kErrorCodeSuccess);
   }
   string Type() const { return "ActionProcessorTestAction"; }
 };
@@ -66,10 +66,10 @@
         processing_done_called_(false),
         processing_stopped_called_(false),
         action_completed_called_(false),
-        action_exit_code_(kActionCodeError) {}
+        action_exit_code_(kErrorCodeError) {}
 
   virtual void ProcessingDone(const ActionProcessor* processor,
-                              ActionExitCode code) {
+                              ErrorCode code) {
     EXPECT_EQ(processor_, processor);
     EXPECT_FALSE(processing_done_called_);
     processing_done_called_ = true;
@@ -81,7 +81,7 @@
   }
   virtual void ActionCompleted(ActionProcessor* processor,
                                AbstractAction* action,
-                               ActionExitCode code) {
+                               ErrorCode code) {
     EXPECT_EQ(processor_, processor);
     EXPECT_FALSE(action_completed_called_);
     action_completed_called_ = true;
@@ -92,7 +92,7 @@
   bool processing_done_called_;
   bool processing_stopped_called_;
   bool action_completed_called_;
-  ActionExitCode action_exit_code_;
+  ErrorCode action_exit_code_;
 };
 }  // namespace {}
 
diff --git a/action_unittest.cc b/action_unittest.cc
index af0e130..e09967f 100644
--- a/action_unittest.cc
+++ b/action_unittest.cc
@@ -33,7 +33,7 @@
   void PerformAction() {}
   void CompleteAction() {
     ASSERT_TRUE(processor());
-    processor()->ActionComplete(this, kActionCodeSuccess);
+    processor()->ActionComplete(this, kErrorCodeSuccess);
   }
   string Type() const { return "ActionTestAction"; }
 };
diff --git a/delta_performer.cc b/delta_performer.cc
index ae1f7e5..940bfa5 100644
--- a/delta_performer.cc
+++ b/delta_performer.cc
@@ -262,8 +262,8 @@
     const std::vector<char>& payload,
     DeltaArchiveManifest* manifest,
     uint64_t* metadata_size,
-    ActionExitCode* error) {
-  *error = kActionCodeSuccess;
+    ErrorCode* error) {
+  *error = kErrorCodeSuccess;
 
   // manifest_offset is the byte offset where the manifest protobuf begins.
   const uint64_t manifest_offset = GetManifestOffset();
@@ -275,7 +275,7 @@
   // Validate the magic string.
   if (memcmp(payload.data(), kDeltaMagic, strlen(kDeltaMagic)) != 0) {
     LOG(ERROR) << "Bad payload format -- invalid delta magic.";
-    *error = kActionCodeDownloadInvalidMetadataMagicString;
+    *error = kErrorCodeDownloadInvalidMetadataMagicString;
     return kMetadataParseError;
   }
 
@@ -304,7 +304,7 @@
       LOG(ERROR) << "Mandatory metadata size in Omaha response ("
                  << install_plan_->metadata_size << ") is missing/incorrect."
                  << ", Actual = " << *metadata_size;
-      *error = kActionCodeDownloadInvalidMetadataSize;
+      *error = kErrorCodeDownloadInvalidMetadataSize;
       return kMetadataParseError;
     }
   }
@@ -328,13 +328,13 @@
                  << install_plan_->metadata_size
                  << ") in Omaha response as validation is not mandatory. "
                  << "Trusting metadata size in payload = " << *metadata_size;
-    SendUmaStat(kActionCodeDownloadInvalidMetadataSize);
+    SendUmaStat(kErrorCodeDownloadInvalidMetadataSize);
   }
 
   // We have the full metadata in |payload|. Verify its integrity
   // and authenticity based on the information we have in Omaha response.
   *error = ValidateMetadataSignature(&payload[0], *metadata_size);
-  if (*error != kActionCodeSuccess) {
+  if (*error != kErrorCodeSuccess) {
     if (install_plan_->hash_checks_mandatory) {
       LOG(ERROR) << "Mandatory metadata signature validation failed";
       return kMetadataParseError;
@@ -343,14 +343,14 @@
     // For non-mandatory cases, just send a UMA stat.
     LOG(WARNING) << "Ignoring metadata signature validation failures";
     SendUmaStat(*error);
-    *error = kActionCodeSuccess;
+    *error = kErrorCodeSuccess;
   }
 
   // The metadata in |payload| is deemed valid. So, it's now safe to
   // parse the protobuf.
   if (!manifest->ParseFromArray(&payload[manifest_offset], manifest_size)) {
     LOG(ERROR) << "Unable to parse manifest in update file.";
-    *error = kActionCodeDownloadManifestParseError;
+    *error = kErrorCodeDownloadManifestParseError;
     return kMetadataParseError;
   }
   return kMetadataParseSuccess;
@@ -361,8 +361,8 @@
 // were written, or false on any error, regardless of progress
 // and stores an action exit code in |error|.
 bool DeltaPerformer::Write(const void* bytes, size_t count,
-                           ActionExitCode *error) {
-  *error = kActionCodeSuccess;
+                           ErrorCode *error) {
+  *error = kErrorCodeSuccess;
 
   const char* c_bytes = reinterpret_cast<const char*>(bytes);
   buffer_.insert(buffer_.end(), c_bytes, c_bytes + count);
@@ -393,7 +393,7 @@
 
     LogPartitionInfo(manifest_);
     if (!PrimeUpdateState()) {
-      *error = kActionCodeDownloadStateInitializationError;
+      *error = kErrorCodeDownloadStateInitializationError;
       LOG(ERROR) << "Unable to prime the update state.";
       return false;
     }
@@ -437,7 +437,7 @@
       // called. Otherwise, we might be failing operations before even if there
       // isn't sufficient data to compute the proper hash.
       *error = ValidateOperationHash(op);
-      if (*error != kActionCodeSuccess) {
+      if (*error != kErrorCodeSuccess) {
         if (install_plan_->hash_checks_mandatory) {
           LOG(ERROR) << "Mandatory operation hash check failed";
           return false;
@@ -446,7 +446,7 @@
         // For non-mandatory cases, just send a UMA stat.
         LOG(WARNING) << "Ignoring operation validation errors";
         SendUmaStat(*error);
-        *error = kActionCodeSuccess;
+        *error = kErrorCodeSuccess;
       }
     }
 
@@ -459,21 +459,21 @@
       if (!PerformReplaceOperation(op, is_kernel_partition)) {
         LOG(ERROR) << "Failed to perform replace operation "
                    << next_operation_num_;
-        *error = kActionCodeDownloadOperationExecutionError;
+        *error = kErrorCodeDownloadOperationExecutionError;
         return false;
       }
     } else if (op.type() == DeltaArchiveManifest_InstallOperation_Type_MOVE) {
       if (!PerformMoveOperation(op, is_kernel_partition)) {
         LOG(ERROR) << "Failed to perform move operation "
                    << next_operation_num_;
-        *error = kActionCodeDownloadOperationExecutionError;
+        *error = kErrorCodeDownloadOperationExecutionError;
         return false;
       }
     } else if (op.type() == DeltaArchiveManifest_InstallOperation_Type_BSDIFF) {
       if (!PerformBsdiffOperation(op, is_kernel_partition)) {
         LOG(ERROR) << "Failed to perform bsdiff operation "
                    << next_operation_num_;
-        *error = kActionCodeDownloadOperationExecutionError;
+        *error = kErrorCodeDownloadOperationExecutionError;
         return false;
       }
     }
@@ -772,19 +772,19 @@
   return true;
 }
 
-ActionExitCode DeltaPerformer::ValidateMetadataSignature(
+ErrorCode DeltaPerformer::ValidateMetadataSignature(
     const char* metadata, uint64_t metadata_size) {
 
   if (install_plan_->metadata_signature.empty()) {
     if (install_plan_->hash_checks_mandatory) {
       LOG(ERROR) << "Missing mandatory metadata signature in Omaha response";
-      return kActionCodeDownloadMetadataSignatureMissingError;
+      return kErrorCodeDownloadMetadataSignatureMissingError;
     }
 
     // For non-mandatory cases, just send a UMA stat.
     LOG(WARNING) << "Cannot validate metadata as the signature is empty";
-    SendUmaStat(kActionCodeDownloadMetadataSignatureMissingError);
-    return kActionCodeSuccess;
+    SendUmaStat(kErrorCodeDownloadMetadataSignatureMissingError);
+    return kErrorCodeSuccess;
   }
 
   // Convert base64-encoded signature to raw bytes.
@@ -793,7 +793,7 @@
                                          &metadata_signature)) {
     LOG(ERROR) << "Unable to decode base64 metadata signature: "
                << install_plan_->metadata_signature;
-    return kActionCodeDownloadMetadataSignatureError;
+    return kErrorCodeDownloadMetadataSignatureError;
   }
 
   vector<char> expected_metadata_hash;
@@ -801,21 +801,21 @@
                                               public_key_path_,
                                               &expected_metadata_hash)) {
     LOG(ERROR) << "Unable to compute expected hash from metadata signature";
-    return kActionCodeDownloadMetadataSignatureError;
+    return kErrorCodeDownloadMetadataSignatureError;
   }
 
   OmahaHashCalculator metadata_hasher;
   metadata_hasher.Update(metadata, metadata_size);
   if (!metadata_hasher.Finalize()) {
     LOG(ERROR) << "Unable to compute actual hash of manifest";
-    return kActionCodeDownloadMetadataSignatureVerificationError;
+    return kErrorCodeDownloadMetadataSignatureVerificationError;
   }
 
   vector<char> calculated_metadata_hash = metadata_hasher.raw_hash();
   PayloadSigner::PadRSA2048SHA256Hash(&calculated_metadata_hash);
   if (calculated_metadata_hash.empty()) {
     LOG(ERROR) << "Computed actual hash of metadata is empty.";
-    return kActionCodeDownloadMetadataSignatureVerificationError;
+    return kErrorCodeDownloadMetadataSignatureVerificationError;
   }
 
   if (calculated_metadata_hash != expected_metadata_hash) {
@@ -823,14 +823,14 @@
     utils::HexDumpVector(expected_metadata_hash);
     LOG(ERROR) << "Calculated hash = ";
     utils::HexDumpVector(calculated_metadata_hash);
-    return kActionCodeDownloadMetadataSignatureMismatch;
+    return kErrorCodeDownloadMetadataSignatureMismatch;
   }
 
   LOG(INFO) << "Manifest signature matches expected value in Omaha response";
-  return kActionCodeSuccess;
+  return kErrorCodeSuccess;
 }
 
-ActionExitCode DeltaPerformer::ValidateOperationHash(
+ErrorCode DeltaPerformer::ValidateOperationHash(
     const DeltaArchiveManifest_InstallOperation& operation) {
 
   if (!operation.data_sha256_hash().size()) {
@@ -839,7 +839,7 @@
       // either. So, these operations are always considered validated since the
       // metadata that contains all the non-data-blob portions of the operation
       // has already been validated. This is true for both HTTP and HTTPS cases.
-      return kActionCodeSuccess;
+      return kErrorCodeSuccess;
     }
 
     // No hash is present for an operation that has data blobs. This shouldn't
@@ -859,15 +859,15 @@
       if (install_plan_->hash_checks_mandatory) {
         LOG(ERROR) << "Missing mandatory operation hash for operation "
                    << next_operation_num_ + 1;
-        return kActionCodeDownloadOperationHashMissingError;
+        return kErrorCodeDownloadOperationHashMissingError;
       }
 
       // For non-mandatory cases, just send a UMA stat.
       LOG(WARNING) << "Cannot validate operation " << next_operation_num_ + 1
                    << " as there's no operation hash in manifest";
-      SendUmaStat(kActionCodeDownloadOperationHashMissingError);
+      SendUmaStat(kErrorCodeDownloadOperationHashMissingError);
     }
-    return kActionCodeSuccess;
+    return kErrorCodeSuccess;
   }
 
   vector<char> expected_op_hash;
@@ -880,7 +880,7 @@
   if (!operation_hasher.Finalize()) {
     LOG(ERROR) << "Unable to compute actual hash of operation "
                << next_operation_num_;
-    return kActionCodeDownloadOperationHashVerificationError;
+    return kErrorCodeDownloadOperationHashVerificationError;
   }
 
   vector<char> calculated_op_hash = operation_hasher.raw_hash();
@@ -891,10 +891,10 @@
     LOG(ERROR) << "Calculated hash over " << operation.data_length()
                << " bytes at offset: " << operation.data_offset() << " = ";
     utils::HexDumpVector(calculated_op_hash);
-    return kActionCodeDownloadOperationHashMismatch;
+    return kErrorCodeDownloadOperationHashMismatch;
   }
 
-  return kActionCodeSuccess;
+  return kErrorCodeSuccess;
 }
 
 #define TEST_AND_RETURN_VAL(_retval, _condition)                \
@@ -905,44 +905,44 @@
     }                                                           \
   } while (0);
 
-ActionExitCode DeltaPerformer::VerifyPayload(
+ErrorCode DeltaPerformer::VerifyPayload(
     const std::string& update_check_response_hash,
     const uint64_t update_check_response_size) {
   LOG(INFO) << "Verifying delta payload using public key: " << public_key_path_;
 
   // Verifies the download size.
-  TEST_AND_RETURN_VAL(kActionCodePayloadSizeMismatchError,
+  TEST_AND_RETURN_VAL(kErrorCodePayloadSizeMismatchError,
                       update_check_response_size ==
                       manifest_metadata_size_ + buffer_offset_);
 
   // Verifies the payload hash.
   const string& payload_hash_data = hash_calculator_.hash();
-  TEST_AND_RETURN_VAL(kActionCodeDownloadPayloadVerificationError,
+  TEST_AND_RETURN_VAL(kErrorCodeDownloadPayloadVerificationError,
                       !payload_hash_data.empty());
-  TEST_AND_RETURN_VAL(kActionCodePayloadHashMismatchError,
+  TEST_AND_RETURN_VAL(kErrorCodePayloadHashMismatchError,
                       payload_hash_data == update_check_response_hash);
 
   // Verifies the signed payload hash.
   if (!utils::FileExists(public_key_path_.c_str())) {
     LOG(WARNING) << "Not verifying signed delta payload -- missing public key.";
-    return kActionCodeSuccess;
+    return kErrorCodeSuccess;
   }
-  TEST_AND_RETURN_VAL(kActionCodeSignedDeltaPayloadExpectedError,
+  TEST_AND_RETURN_VAL(kErrorCodeSignedDeltaPayloadExpectedError,
                       !signatures_message_data_.empty());
   vector<char> signed_hash_data;
-  TEST_AND_RETURN_VAL(kActionCodeDownloadPayloadPubKeyVerificationError,
+  TEST_AND_RETURN_VAL(kErrorCodeDownloadPayloadPubKeyVerificationError,
                       PayloadSigner::VerifySignature(
                           signatures_message_data_,
                           public_key_path_,
                           &signed_hash_data));
   OmahaHashCalculator signed_hasher;
-  TEST_AND_RETURN_VAL(kActionCodeDownloadPayloadPubKeyVerificationError,
+  TEST_AND_RETURN_VAL(kErrorCodeDownloadPayloadPubKeyVerificationError,
                       signed_hasher.SetContext(signed_hash_context_));
-  TEST_AND_RETURN_VAL(kActionCodeDownloadPayloadPubKeyVerificationError,
+  TEST_AND_RETURN_VAL(kErrorCodeDownloadPayloadPubKeyVerificationError,
                       signed_hasher.Finalize());
   vector<char> hash_data = signed_hasher.raw_hash();
   PayloadSigner::PadRSA2048SHA256Hash(&hash_data);
-  TEST_AND_RETURN_VAL(kActionCodeDownloadPayloadPubKeyVerificationError,
+  TEST_AND_RETURN_VAL(kErrorCodeDownloadPayloadPubKeyVerificationError,
                       !hash_data.empty());
   if (hash_data != signed_hash_data) {
     LOG(ERROR) << "Public key verification failed, thus update failed. "
@@ -950,7 +950,7 @@
     utils::HexDumpVector(signed_hash_data);
     LOG(ERROR) << "Computed Signature:";
     utils::HexDumpVector(hash_data);
-    return kActionCodeDownloadPayloadPubKeyVerificationError;
+    return kErrorCodeDownloadPayloadPubKeyVerificationError;
   }
 
   // At this point, we are guaranteed to have downloaded a full payload, i.e
@@ -960,7 +960,7 @@
   // indicate that to the payload state so that AU can backoff appropriately.
   system_state_->payload_state()->DownloadComplete();
 
-  return kActionCodeSuccess;
+  return kErrorCodeSuccess;
 }
 
 bool DeltaPerformer::GetNewPartitionInfo(uint64_t* kernel_size,
@@ -1198,7 +1198,7 @@
   return true;
 }
 
-void DeltaPerformer::SendUmaStat(ActionExitCode code) {
+void DeltaPerformer::SendUmaStat(ErrorCode code) {
   utils::SendErrorCodeToUma(system_state_, code);
 }
 
diff --git a/delta_performer.h b/delta_performer.h
index 8370b81..1f8f5cb 100644
--- a/delta_performer.h
+++ b/delta_performer.h
@@ -85,13 +85,13 @@
   // FileWriter's Write implementation where caller doesn't care about
   // error codes.
   bool Write(const void* bytes, size_t count) {
-    ActionExitCode error;
+    ErrorCode error;
     return Write(bytes, count, &error);
   }
 
   // FileWriter's Write implementation that returns a more specific |error| code
   // in case of failures in Write operation.
-  bool Write(const void* bytes, size_t count, ActionExitCode *error);
+  bool Write(const void* bytes, size_t count, ErrorCode *error);
 
   // Wrapper around close. Returns 0 on success or -errno on error.
   // Closes both 'path' given to Open() and the kernel path.
@@ -99,12 +99,12 @@
 
   // Verifies the downloaded payload against the signed hash included in the
   // payload, against the update check hash (which is in base64 format)  and
-  // size using the public key and returns kActionCodeSuccess on success, an
+  // size using the public key and returns kErrorCodeSuccess on success, an
   // error code on failure.  This method should be called after closing the
   // stream. Note this method skips the signed hash check if the public key is
-  // unavailable; it returns kActionCodeSignedDeltaPayloadExpectedError if the
+  // unavailable; it returns kErrorCodeSignedDeltaPayloadExpectedError if the
   // public key is available but the delta payload doesn't include a signature.
-  ActionExitCode VerifyPayload(const std::string& update_check_response_hash,
+  ErrorCode VerifyPayload(const std::string& update_check_response_hash,
                                const uint64_t update_check_response_size);
 
   // Reads from the update manifest the expected sizes and hashes of the target
@@ -154,7 +154,7 @@
       const std::vector<char>& payload,
       DeltaArchiveManifest* manifest,
       uint64_t* metadata_size,
-      ActionExitCode* error);
+      ErrorCode* error);
 
   void set_public_key_path(const std::string& public_key_path) {
     public_key_path_ = public_key_path;
@@ -195,19 +195,19 @@
 
   // Validates that the hash of the blobs corresponding to the given |operation|
   // matches what's specified in the manifest in the payload.
-  // Returns kActionCodeSuccess on match or a suitable error code otherwise.
-  ActionExitCode ValidateOperationHash(
+  // Returns kErrorCodeSuccess on match or a suitable error code otherwise.
+  ErrorCode ValidateOperationHash(
       const DeltaArchiveManifest_InstallOperation& operation);
 
   // Interprets the given |protobuf| as a DeltaArchiveManifest protocol buffer
   // of the given protobuf_length and verifies that the signed hash of the
   // metadata matches what's specified in the install plan from Omaha.
-  // Returns kActionCodeSuccess on match or a suitable error code otherwise.
+  // Returns kErrorCodeSuccess on match or a suitable error code otherwise.
   // This method must be called before any part of the |protobuf| is parsed
   // so that a man-in-the-middle attack on the SSL connection to the payload
   // server doesn't exploit any vulnerability in the code that parses the
   // protocol buffer.
-  ActionExitCode ValidateMetadataSignature(const char* protobuf,
+  ErrorCode ValidateMetadataSignature(const char* protobuf,
                                            uint64_t protobuf_length);
 
   // Returns true on success.
@@ -244,7 +244,7 @@
   bool PrimeUpdateState();
 
   // Sends UMA statistics for the given error code.
-  void SendUmaStat(ActionExitCode code);
+  void SendUmaStat(ErrorCode code);
 
   // Update Engine preference store.
   PrefsInterface* prefs_;
diff --git a/delta_performer_unittest.cc b/delta_performer_unittest.cc
index 83f3863..57c16e7 100644
--- a/delta_performer_unittest.cc
+++ b/delta_performer_unittest.cc
@@ -558,7 +558,7 @@
   EXPECT_EQ(0, (*performer)->Open(state->a_img.c_str(), 0, 0));
   EXPECT_TRUE((*performer)->OpenKernel(state->old_kernel.c_str()));
 
-  ActionExitCode expected_error, actual_error;
+  ErrorCode expected_error, actual_error;
   bool continue_writing;
   switch(op_hash_test) {
     case kInvalidOperationData: {
@@ -567,7 +567,7 @@
       int some_offset = state->metadata_size + 300;
       LOG(INFO) << "Tampered value at offset: " << some_offset;
       state->delta[some_offset]++;
-      expected_error = kActionCodeDownloadOperationHashMismatch;
+      expected_error = kErrorCodeDownloadOperationHashMismatch;
       continue_writing = false;
       break;
     }
@@ -575,7 +575,7 @@
     case kValidOperationData:
     default:
       // no change.
-      expected_error = kActionCodeSuccess;
+      expected_error = kErrorCodeSuccess;
       continue_writing = true;
       break;
   }
@@ -588,7 +588,7 @@
                                                 count,
                                                 &actual_error));
     // Normally write_succeeded should be true every time and
-    // actual_error should be kActionCodeSuccess. If so, continue the loop.
+    // actual_error should be kErrorCodeSuccess. If so, continue the loop.
     // But if we seeded an operation hash error above, then write_succeeded
     // will be false. The failure may happen at any operation n. So, all
     // Writes until n-1 should succeed and the nth operation will fail with
@@ -603,7 +603,7 @@
       }
     }
 
-    EXPECT_EQ(kActionCodeSuccess, actual_error);
+    EXPECT_EQ(kErrorCodeSuccess, actual_error);
   }
 
   // If we had continued all the way through, Close should succeed.
@@ -617,13 +617,13 @@
 
 void VerifyPayloadResult(DeltaPerformer* performer,
                          DeltaState* state,
-                         ActionExitCode expected_result) {
+                         ErrorCode expected_result) {
   if (!performer) {
     EXPECT_TRUE(!"Skipping payload verification since performer is NULL.");
     return;
   }
 
-  int expected_times = (expected_result == kActionCodeSuccess) ? 1 : 0;
+  int expected_times = (expected_result == kErrorCodeSuccess) ? 1 : 0;
   EXPECT_CALL(*(state->mock_system_state.mock_payload_state()),
               DownloadComplete()).Times(expected_times);
 
@@ -634,7 +634,7 @@
       state->delta.size()));
   LOG(INFO) << "Verified payload.";
 
-  if (expected_result != kActionCodeSuccess) {
+  if (expected_result != kErrorCodeSuccess) {
     // no need to verify new partition if VerifyPayload failed.
     return;
   }
@@ -672,13 +672,13 @@
 void VerifyPayload(DeltaPerformer* performer,
                    DeltaState* state,
                    SignatureTest signature_test) {
-  ActionExitCode expected_result = kActionCodeSuccess;
+  ErrorCode expected_result = kErrorCodeSuccess;
   switch (signature_test) {
     case kSignatureNone:
-      expected_result = kActionCodeSignedDeltaPayloadExpectedError;
+      expected_result = kErrorCodeSignedDeltaPayloadExpectedError;
       break;
     case kSignatureGeneratedShellBadKey:
-      expected_result = kActionCodeDownloadPayloadPubKeyVerificationError;
+      expected_result = kErrorCodeDownloadPayloadPubKeyVerificationError;
       break;
     default: break;  // appease gcc
   }
@@ -727,7 +727,7 @@
   EXPECT_TRUE(performer.Write(&version, 8));
 
   install_plan.metadata_size = expected_metadata_size;
-  ActionExitCode error_code;
+  ErrorCode error_code;
   // When filling in size in manifest, exclude the size of the 20-byte header.
   uint64_t size_in_manifest = htobe64(actual_metadata_size - 20);
   bool result = performer.Write(&size_in_manifest, 8, &error_code);
@@ -736,7 +736,7 @@
     EXPECT_TRUE(result);
   } else {
     EXPECT_FALSE(result);
-    EXPECT_EQ(kActionCodeDownloadInvalidMetadataSize, error_code);
+    EXPECT_EQ(kErrorCodeDownloadInvalidMetadataSize, error_code);
   }
 
   EXPECT_LT(performer.Close(), 0);
@@ -771,20 +771,20 @@
   install_plan.metadata_size = state.metadata_size;
 
   DeltaPerformer::MetadataParseResult expected_result, actual_result;
-  ActionExitCode expected_error, actual_error;
+  ErrorCode expected_error, actual_error;
 
   // Fill up the metadata signature in install plan according to the test.
   switch (metadata_signature_test) {
     case kEmptyMetadataSignature:
       install_plan.metadata_signature.clear();
       expected_result = DeltaPerformer::kMetadataParseError;
-      expected_error = kActionCodeDownloadMetadataSignatureMissingError;
+      expected_error = kErrorCodeDownloadMetadataSignatureMissingError;
       break;
 
     case kInvalidMetadataSignature:
       install_plan.metadata_signature = kBogusMetadataSignature1;
       expected_result = DeltaPerformer::kMetadataParseError;
-      expected_error = kActionCodeDownloadMetadataSignatureMismatch;
+      expected_error = kErrorCodeDownloadMetadataSignatureMismatch;
       break;
 
     case kValidMetadataSignature:
@@ -799,14 +799,14 @@
           &install_plan.metadata_signature));
       EXPECT_FALSE(install_plan.metadata_signature.empty());
       expected_result = DeltaPerformer::kMetadataParseSuccess;
-      expected_error = kActionCodeSuccess;
+      expected_error = kErrorCodeSuccess;
       break;
   }
 
   // Ignore the expected result/error if hash checks are not mandatory.
   if (!hash_checks_mandatory) {
     expected_result = DeltaPerformer::kMetadataParseSuccess;
-    expected_error = kActionCodeSuccess;
+    expected_error = kErrorCodeSuccess;
   }
 
   // Create the delta performer object.
@@ -826,7 +826,7 @@
 
   // Init actual_error with an invalid value so that we make sure
   // ParsePayloadMetadata properly populates it in all cases.
-  actual_error = kActionCodeUmaReportedMax;
+  actual_error = kErrorCodeUmaReportedMax;
   actual_result = delta_performer.ParsePayloadMetadata(payload, &manifest,
       &parsed_metadata_size, &actual_error);
 
diff --git a/download_action.cc b/download_action.cc
index 1ee3a8e..da6b1fc 100644
--- a/download_action.cc
+++ b/download_action.cc
@@ -27,7 +27,7 @@
       system_state_(system_state),
       http_fetcher_(http_fetcher),
       writer_(NULL),
-      code_(kActionCodeSuccess),
+      code_(kErrorCodeSuccess),
       delegate_(NULL),
       bytes_received_(0) {}
 
@@ -57,7 +57,7 @@
   if (rc < 0) {
     LOG(ERROR) << "Unable to open output file " << install_plan_.install_path;
     // report error to processor
-    processor_->ActionComplete(this, kActionCodeInstallDeviceOpenError);
+    processor_->ActionComplete(this, kErrorCodeInstallDeviceOpenError);
     return;
   }
   if (delta_performer_.get() &&
@@ -66,7 +66,7 @@
     LOG(ERROR) << "Unable to open kernel file "
                << install_plan_.kernel_install_path.c_str();
     writer_->Close();
-    processor_->ActionComplete(this, kActionCodeKernelDeviceOpenError);
+    processor_->ActionComplete(this, kErrorCodeKernelDeviceOpenError);
     return;
   }
   if (delegate_) {
@@ -117,12 +117,12 @@
   if (delegate_) {
     delegate_->SetDownloadStatus(false);  // Set to inactive.
   }
-  ActionExitCode code =
-      successful ? kActionCodeSuccess : kActionCodeDownloadTransferError;
-  if (code == kActionCodeSuccess && delta_performer_.get()) {
+  ErrorCode code =
+      successful ? kErrorCodeSuccess : kErrorCodeDownloadTransferError;
+  if (code == kErrorCodeSuccess && delta_performer_.get()) {
     code = delta_performer_->VerifyPayload(install_plan_.payload_hash,
                                            install_plan_.payload_size);
-    if (code != kActionCodeSuccess) {
+    if (code != kErrorCodeSuccess) {
       LOG(ERROR) << "Download of " << install_plan_.download_url
                  << " failed due to payload verification error.";
     } else if (!delta_performer_->GetNewPartitionInfo(
@@ -131,18 +131,18 @@
         &install_plan_.rootfs_size,
         &install_plan_.rootfs_hash)) {
       LOG(ERROR) << "Unable to get new partition hash info.";
-      code = kActionCodeDownloadNewPartitionInfoError;
+      code = kErrorCodeDownloadNewPartitionInfoError;
     }
   }
 
   // Write the path to the output pipe if we're successful.
-  if (code == kActionCodeSuccess && HasOutputPipe())
+  if (code == kErrorCodeSuccess && HasOutputPipe())
     SetOutputObject(install_plan_);
   processor_->ActionComplete(this, code);
 }
 
 void DownloadAction::TransferTerminated(HttpFetcher *fetcher) {
-  if (code_ != kActionCodeSuccess) {
+  if (code_ != kErrorCodeSuccess) {
     processor_->ActionComplete(this, code_);
   }
 }
diff --git a/download_action.h b/download_action.h
index 6e334f6..318ece8 100644
--- a/download_action.h
+++ b/download_action.h
@@ -114,7 +114,7 @@
 
   // Used by TransferTerminated to figure if this action terminated itself or
   // was terminated by the action processor.
-  ActionExitCode code_;
+  ErrorCode code_;
 
   // For reporting status to outsiders
   DownloadActionDelegate* delegate_;
diff --git a/download_action_unittest.cc b/download_action_unittest.cc
index 657155b..3911d55 100644
--- a/download_action_unittest.cc
+++ b/download_action_unittest.cc
@@ -36,7 +36,7 @@
 
 class DownloadActionTestProcessorDelegate : public ActionProcessorDelegate {
  public:
-  explicit DownloadActionTestProcessorDelegate(ActionExitCode expected_code)
+  explicit DownloadActionTestProcessorDelegate(ErrorCode expected_code)
       : loop_(NULL),
         processing_done_called_(false),
         expected_code_(expected_code) {}
@@ -44,12 +44,12 @@
     EXPECT_TRUE(processing_done_called_);
   }
   virtual void ProcessingDone(const ActionProcessor* processor,
-                              ActionExitCode code) {
+                              ErrorCode code) {
     ASSERT_TRUE(loop_);
     g_main_loop_quit(loop_);
     vector<char> found_data;
     ASSERT_TRUE(utils::ReadFile(path_, &found_data));
-    if (expected_code_ != kActionCodeDownloadWriteError) {
+    if (expected_code_ != kErrorCodeDownloadWriteError) {
       ASSERT_EQ(expected_data_.size(), found_data.size());
       for (unsigned i = 0; i < expected_data_.size(); i++) {
         EXPECT_EQ(expected_data_[i], found_data[i]);
@@ -60,12 +60,12 @@
 
   virtual void ActionCompleted(ActionProcessor* processor,
                                AbstractAction* action,
-                               ActionExitCode code) {
+                               ErrorCode code) {
     const string type = action->Type();
     if (type == DownloadAction::StaticType()) {
       EXPECT_EQ(expected_code_, code);
     } else {
-      EXPECT_EQ(kActionCodeSuccess, code);
+      EXPECT_EQ(kErrorCodeSuccess, code);
     }
   }
 
@@ -73,7 +73,7 @@
   string path_;
   vector<char> expected_data_;
   bool processing_done_called_;
-  ActionExitCode expected_code_;
+  ErrorCode expected_code_;
 };
 
 class TestDirectFileWriter : public DirectFileWriter {
@@ -159,9 +159,9 @@
     EXPECT_CALL(download_delegate, BytesReceived(_, _)).Times(AtLeast(1));
     EXPECT_CALL(download_delegate, SetDownloadStatus(false)).Times(1);
   }
-  ActionExitCode expected_code = kActionCodeSuccess;
+  ErrorCode expected_code = kErrorCodeSuccess;
   if (fail_write > 0)
-    expected_code = kActionCodeDownloadWriteError;
+    expected_code = kErrorCodeDownloadWriteError;
   DownloadActionTestProcessorDelegate delegate(expected_code);
   delegate.loop_ = loop;
   delegate.expected_data_ = vector<char>(data.begin() + 1, data.end());
@@ -320,7 +320,7 @@
     ASSERT_TRUE(HasInputObject());
     EXPECT_TRUE(expected_input_object_ == GetInputObject());
     ASSERT_TRUE(processor());
-    processor()->ActionComplete(this, kActionCodeSuccess);
+    processor()->ActionComplete(this, kErrorCodeSuccess);
   }
   string Type() const { return "DownloadActionTestAction"; }
   InstallPlan expected_input_object_;
@@ -333,7 +333,7 @@
 // only by the test PassObjectOutTest.
 class PassObjectOutTestProcessorDelegate : public ActionProcessorDelegate {
  public:
-  void ProcessingDone(const ActionProcessor* processor, ActionExitCode code) {
+  void ProcessingDone(const ActionProcessor* processor, ErrorCode code) {
     ASSERT_TRUE(loop_);
     g_main_loop_quit(loop_);
   }
diff --git a/error_code.h b/error_code.h
new file mode 100644
index 0000000..db023f7
--- /dev/null
+++ b/error_code.h
@@ -0,0 +1,107 @@
+// Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_ERROR_CODE_H__
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_ERROR_CODE_H__
+
+namespace chromeos_update_engine {
+
+// Action exit codes.
+enum ErrorCode {
+  kErrorCodeSuccess = 0,
+  kErrorCodeError = 1,
+  kErrorCodeOmahaRequestError = 2,
+  kErrorCodeOmahaResponseHandlerError = 3,
+  kErrorCodeFilesystemCopierError = 4,
+  kErrorCodePostinstallRunnerError = 5,
+  kErrorCodeSetBootableFlagError = 6,  // TODO(petkov): Unused. Recycle?
+  kErrorCodeInstallDeviceOpenError = 7,
+  kErrorCodeKernelDeviceOpenError = 8,
+  kErrorCodeDownloadTransferError = 9,
+  kErrorCodePayloadHashMismatchError = 10,
+  kErrorCodePayloadSizeMismatchError = 11,
+  kErrorCodeDownloadPayloadVerificationError = 12,
+  kErrorCodeDownloadNewPartitionInfoError = 13,
+  kErrorCodeDownloadWriteError = 14,
+  kErrorCodeNewRootfsVerificationError = 15,
+  kErrorCodeNewKernelVerificationError = 16,
+  kErrorCodeSignedDeltaPayloadExpectedError = 17,
+  kErrorCodeDownloadPayloadPubKeyVerificationError = 18,
+  kErrorCodePostinstallBootedFromFirmwareB = 19,
+  kErrorCodeDownloadStateInitializationError = 20,
+  kErrorCodeDownloadInvalidMetadataMagicString = 21,
+  kErrorCodeDownloadSignatureMissingInManifest = 22,
+  kErrorCodeDownloadManifestParseError = 23,
+  kErrorCodeDownloadMetadataSignatureError = 24,
+  kErrorCodeDownloadMetadataSignatureVerificationError = 25,
+  kErrorCodeDownloadMetadataSignatureMismatch = 26,
+  kErrorCodeDownloadOperationHashVerificationError = 27,
+  kErrorCodeDownloadOperationExecutionError = 28,
+  kErrorCodeDownloadOperationHashMismatch = 29,
+  kErrorCodeOmahaRequestEmptyResponseError = 30,
+  kErrorCodeOmahaRequestXMLParseError = 31,
+  kErrorCodeDownloadInvalidMetadataSize = 32,
+  kErrorCodeDownloadInvalidMetadataSignature = 33,
+  kErrorCodeOmahaResponseInvalid = 34,
+  kErrorCodeOmahaUpdateIgnoredPerPolicy = 35,
+  kErrorCodeOmahaUpdateDeferredPerPolicy = 36,
+  kErrorCodeOmahaErrorInHTTPResponse = 37,
+  kErrorCodeDownloadOperationHashMissingError = 38,
+  kErrorCodeDownloadMetadataSignatureMissingError = 39,
+  kErrorCodeOmahaUpdateDeferredForBackoff = 40,
+  kErrorCodePostinstallPowerwashError = 41,
+  kErrorCodeUpdateCanceledByChannelChange = 42,
+
+  // Note: When adding new error codes, please remember to add the
+  // error into one of the buckets in PayloadState::UpdateFailed method so
+  // that the retries across URLs and the payload backoff mechanism work
+  // correctly for those new error codes.
+
+  // Any code above this is sent to both Omaha and UMA as-is, except
+  // kErrorCodeOmahaErrorInHTTPResponse (see error code 2000 for more details).
+  // Codes/flags below this line is sent only to Omaha and not to UMA.
+
+  // kErrorCodeUmaReportedMax is not an error code per se, it's just the count
+  // of the number of enums above.  Add any new errors above this line if you
+  // want them to show up on UMA. Stuff below this line will not be sent to UMA
+  // but is used for other errors that are sent to Omaha. We don't assign any
+  // particular value for this enum so that it's just one more than the last
+  // one above and thus always represents the correct count of UMA metrics
+  // buckets, even when new enums are added above this line in future. See
+  // utils::SendErrorCodeToUma on how this enum is used.
+  kErrorCodeUmaReportedMax,
+
+  // use the 2xxx range to encode HTTP errors. These errors are available in
+  // Dremel with the individual granularity. But for UMA purposes, all these
+  // errors are aggregated into one: kErrorCodeOmahaErrorInHTTPResponse.
+  kErrorCodeOmahaRequestHTTPResponseBase = 2000,  // + HTTP response code
+
+  // TODO(jaysri): Move out all the bit masks into separate constants
+  // outside the enum as part of fixing bug 34369.
+  // Bit flags. Remember to update the mask below for new bits.
+
+  // Set if boot mode not normal.
+  kErrorCodeDevModeFlag        = 1 << 31,
+
+  // Set if resuming an interruped update.
+  kErrorCodeResumedFlag         = 1 << 30,
+
+  // Set if using a dev/test image as opposed to an MP-signed image.
+  kErrorCodeTestImageFlag       = 1 << 29,
+
+  // Set if using devserver or Omaha sandbox (using crosh autest).
+  kErrorCodeTestOmahaUrlFlag    = 1 << 28,
+
+  // Mask that indicates bit positions that are used to indicate special flags
+  // that are embedded in the error code to provide additional context about
+  // the system in which the error was encountered.
+  kErrorCodeSpecialFlags = (kErrorCodeDevModeFlag |
+                            kErrorCodeResumedFlag |
+                            kErrorCodeTestImageFlag |
+                            kErrorCodeTestOmahaUrlFlag)
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_ACTION_PROCESSOR_H__
diff --git a/file_writer.h b/file_writer.h
index b9b45e8..57d0498 100644
--- a/file_writer.h
+++ b/file_writer.h
@@ -38,8 +38,8 @@
   // can override if they wish to return more specific error codes.
   virtual bool Write(const void* bytes,
                      size_t count,
-                     ActionExitCode* error) {
-     *error = kActionCodeDownloadWriteError;
+                     ErrorCode* error) {
+     *error = kErrorCodeDownloadWriteError;
      return Write(bytes, count);
   }
 
diff --git a/filesystem_copier_action.cc b/filesystem_copier_action.cc
index 1561f93..7024b67 100644
--- a/filesystem_copier_action.cc
+++ b/filesystem_copier_action.cc
@@ -73,7 +73,7 @@
     // No copy or hash verification needed. Done!
     if (HasOutputPipe())
       SetOutputObject(install_plan_);
-    abort_action_completer.set_code(kActionCodeSuccess);
+    abort_action_completer.set_code(kErrorCodeSuccess);
     return;
   }
 
@@ -132,7 +132,7 @@
   return (src_stream_ != NULL);
 }
 
-void FilesystemCopierAction::Cleanup(ActionExitCode code) {
+void FilesystemCopierAction::Cleanup(ErrorCode code) {
   for (int i = 0; i < 2; i++) {
     g_object_unref(canceller_[i]);
     canceller_[i] = NULL;
@@ -145,7 +145,7 @@
   }
   if (cancelled_)
     return;
-  if (code == kActionCodeSuccess && HasOutputPipe())
+  if (code == kErrorCodeSuccess && HasOutputPipe())
     SetOutputObject(install_plan_);
   processor_->ActionComplete(this, code);
 }
@@ -244,7 +244,7 @@
   }
   if (failed_ || cancelled_) {
     if (!reading && !writing) {
-      Cleanup(kActionCodeError);
+      Cleanup(kErrorCodeError);
     }
     return;
   }
@@ -278,18 +278,18 @@
   }
   if (!reading && !writing) {
     // We're done!
-    ActionExitCode code = kActionCodeSuccess;
+    ErrorCode code = kErrorCodeSuccess;
     if (hasher_.Finalize()) {
       LOG(INFO) << "Hash: " << hasher_.hash();
       if (verify_hash_) {
         if (copying_kernel_install_path_) {
           if (install_plan_.kernel_hash != hasher_.raw_hash()) {
-            code = kActionCodeNewKernelVerificationError;
+            code = kErrorCodeNewKernelVerificationError;
             LOG(ERROR) << "New kernel verification failed.";
           }
         } else {
           if (install_plan_.rootfs_hash != hasher_.raw_hash()) {
-            code = kActionCodeNewRootfsVerificationError;
+            code = kErrorCodeNewRootfsVerificationError;
             LOG(ERROR) << "New rootfs verification failed.";
           }
         }
@@ -302,7 +302,7 @@
       }
     } else {
       LOG(ERROR) << "Unable to finalize the hash.";
-      code = kActionCodeError;
+      code = kErrorCodeError;
     }
     Cleanup(code);
   }
diff --git a/filesystem_copier_action.h b/filesystem_copier_action.h
index 366ae40..acbdd05 100644
--- a/filesystem_copier_action.h
+++ b/filesystem_copier_action.h
@@ -91,7 +91,7 @@
   // Cleans up all the variables we use for async operations and tells the
   // ActionProcessor we're done w/ |code| as passed in. |cancelled_| should be
   // true if TerminateProcessing() was called.
-  void Cleanup(ActionExitCode code);
+  void Cleanup(ErrorCode code);
 
   // Determine, if possible, the source file system size to avoid copying the
   // whole partition. Currently this supports only the root file system assuming
diff --git a/filesystem_copier_action_unittest.cc b/filesystem_copier_action_unittest.cc
index bf44c4f..3ffed88 100644
--- a/filesystem_copier_action_unittest.cc
+++ b/filesystem_copier_action_unittest.cc
@@ -45,7 +45,7 @@
  public:
   FilesystemCopierActionTestDelegate(GMainLoop* loop,
                                      FilesystemCopierAction* action)
-      : loop_(loop), action_(action), ran_(false), code_(kActionCodeError) {}
+      : loop_(loop), action_(action), ran_(false), code_(kErrorCodeError) {}
   void ExitMainLoop() {
     GMainContext* context = g_main_loop_get_context(loop_);
     // We cannot use g_main_context_pending() alone to determine if it is safe
@@ -58,7 +58,7 @@
     }
     g_main_loop_quit(loop_);
   }
-  void ProcessingDone(const ActionProcessor* processor, ActionExitCode code) {
+  void ProcessingDone(const ActionProcessor* processor, ErrorCode code) {
     ExitMainLoop();
   }
   void ProcessingStopped(const ActionProcessor* processor) {
@@ -66,19 +66,19 @@
   }
   void ActionCompleted(ActionProcessor* processor,
                        AbstractAction* action,
-                       ActionExitCode code) {
+                       ErrorCode code) {
     if (action->Type() == FilesystemCopierAction::StaticType()) {
       ran_ = true;
       code_ = code;
     }
   }
   bool ran() const { return ran_; }
-  ActionExitCode code() const { return code_; }
+  ErrorCode code() const { return code_; }
  private:
   GMainLoop* loop_;
   FilesystemCopierAction* action_;
   bool ran_;
-  ActionExitCode code_;
+  ErrorCode code_;
 };
 
 struct StartProcessorCallbackArgs {
@@ -229,18 +229,18 @@
     success = success && is_delegate_ran;
   }
   if (run_out_of_space || terminate_early) {
-    EXPECT_EQ(kActionCodeError, delegate.code());
-    return (kActionCodeError == delegate.code());
+    EXPECT_EQ(kErrorCodeError, delegate.code());
+    return (kErrorCodeError == delegate.code());
   }
   if (verify_hash == 2) {
-    ActionExitCode expected_exit_code =
+    ErrorCode expected_exit_code =
         (use_kernel_partition ?
-         kActionCodeNewKernelVerificationError :
-         kActionCodeNewRootfsVerificationError);
+         kErrorCodeNewKernelVerificationError :
+         kErrorCodeNewRootfsVerificationError);
     EXPECT_EQ(expected_exit_code, delegate.code());
     return (expected_exit_code == delegate.code());
   }
-  EXPECT_EQ(kActionCodeSuccess, delegate.code());
+  EXPECT_EQ(kErrorCodeSuccess, delegate.code());
 
   // Make sure everything in the out_image is there
   vector<char> a_out;
@@ -273,7 +273,7 @@
  public:
   void ActionCompleted(ActionProcessor* processor,
                        AbstractAction* action,
-                       ActionExitCode code) {
+                       ErrorCode code) {
     if (action->Type() == FilesystemCopierAction::StaticType()) {
       ran_ = true;
       code_ = code;
@@ -281,7 +281,7 @@
   }
   GMainLoop *loop_;
   bool ran_;
-  ActionExitCode code_;
+  ErrorCode code_;
 };
 
 TEST_F(FilesystemCopierActionTest, MissingInputObjectTest) {
@@ -300,7 +300,7 @@
   processor.StartProcessing();
   EXPECT_FALSE(processor.IsRunning());
   EXPECT_TRUE(delegate.ran_);
-  EXPECT_EQ(kActionCodeError, delegate.code_);
+  EXPECT_EQ(kErrorCodeError, delegate.code_);
 }
 
 TEST_F(FilesystemCopierActionTest, ResumeTest) {
@@ -325,7 +325,7 @@
   processor.StartProcessing();
   EXPECT_FALSE(processor.IsRunning());
   EXPECT_TRUE(delegate.ran_);
-  EXPECT_EQ(kActionCodeSuccess, delegate.code_);
+  EXPECT_EQ(kErrorCodeSuccess, delegate.code_);
   EXPECT_EQ(kUrl, collector_action.object().download_url);
 }
 
@@ -356,7 +356,7 @@
   processor.StartProcessing();
   EXPECT_FALSE(processor.IsRunning());
   EXPECT_TRUE(delegate.ran_);
-  EXPECT_EQ(kActionCodeError, delegate.code_);
+  EXPECT_EQ(kErrorCodeError, delegate.code_);
 }
 
 TEST_F(FilesystemCopierActionTest, RunAsRootVerifyHashTest) {
diff --git a/integration_unittest.cc b/integration_unittest.cc
index e54c0e2..af5fee4 100644
--- a/integration_unittest.cc
+++ b/integration_unittest.cc
@@ -42,16 +42,16 @@
     EXPECT_TRUE(processing_done_called_);
   }
   virtual void ProcessingDone(const ActionProcessor* processor,
-                              ActionExitCode code) {
+                              ErrorCode code) {
     processing_done_called_ = true;
     g_main_loop_quit(loop_);
   }
 
   virtual void ActionCompleted(ActionProcessor* processor,
                                AbstractAction* action,
-                               ActionExitCode code) {
+                               ErrorCode code) {
     // make sure actions always succeed
-    EXPECT_EQ(kActionCodeSuccess, code);
+    EXPECT_EQ(kErrorCodeSuccess, code);
 
     // Swap in the device path for PostinstallRunnerAction with a loop device
     if (action->Type() == InstallAction::StaticType()) {
diff --git a/mock_payload_state.h b/mock_payload_state.h
index 88578b5..65d99da 100644
--- a/mock_payload_state.h
+++ b/mock_payload_state.h
@@ -24,7 +24,7 @@
   MOCK_METHOD0(UpdateResumed, void());
   MOCK_METHOD0(UpdateRestarted, void());
   MOCK_METHOD0(UpdateSucceeded, void());
-  MOCK_METHOD1(UpdateFailed, void(ActionExitCode error));
+  MOCK_METHOD1(UpdateFailed, void(ErrorCode error));
   MOCK_METHOD0(ShouldBackoffDownload, bool());
 
   // Getters.
diff --git a/omaha_request_action.cc b/omaha_request_action.cc
index 6d2ade4..f2c5c6b 100644
--- a/omaha_request_action.cc
+++ b/omaha_request_action.cc
@@ -327,7 +327,7 @@
   if (ping_only_ &&
       !ShouldPing(ping_active_days_) &&
       !ShouldPing(ping_roll_call_days_)) {
-    processor_->ActionComplete(this, kActionCodeSuccess);
+    processor_->ActionComplete(this, kErrorCodeSuccess);
     return;
   }
   string request_post(GetRequestXml(event_.get(),
@@ -448,7 +448,7 @@
   scoped_ptr_malloc<xmlXPathObject, ScopedPtrXmlXPathObjectFree>
       xpath_nodeset(GetNodeSet(doc, ConstXMLStr(kUpdatecheckNodeXpath)));
   if (!xpath_nodeset.get()) {
-    completer->set_code(kActionCodeOmahaResponseInvalid);
+    completer->set_code(kErrorCodeOmahaResponseInvalid);
     return false;
   }
 
@@ -490,7 +490,7 @@
 
   output_object->update_exists = true;
   SetOutputObject(*output_object);
-  completer->set_code(kActionCodeSuccess);
+  completer->set_code(kErrorCodeSuccess);
 
   return true;
 }
@@ -501,7 +501,7 @@
   // Get status.
   if (!xmlHasProp(update_check_node, ConstXMLStr("status"))) {
     LOG(ERROR) << "Omaha Response missing status";
-    completer->set_code(kActionCodeOmahaResponseInvalid);
+    completer->set_code(kErrorCodeOmahaResponseInvalid);
     return false;
   }
 
@@ -510,13 +510,13 @@
     LOG(INFO) << "No update.";
     output_object->update_exists = false;
     SetOutputObject(*output_object);
-    completer->set_code(kActionCodeSuccess);
+    completer->set_code(kErrorCodeSuccess);
     return false;
   }
 
   if (status != "ok") {
     LOG(ERROR) << "Unknown Omaha response status: " << status;
-    completer->set_code(kActionCodeOmahaResponseInvalid);
+    completer->set_code(kErrorCodeOmahaResponseInvalid);
     return false;
   }
 
@@ -532,7 +532,7 @@
   scoped_ptr_malloc<xmlXPathObject, ScopedPtrXmlXPathObjectFree>
       xpath_nodeset(GetNodeSet(doc, ConstXMLStr(kUpdateUrlNodeXPath)));
   if (!xpath_nodeset.get()) {
-    completer->set_code(kActionCodeOmahaResponseInvalid);
+    completer->set_code(kErrorCodeOmahaResponseInvalid);
     return false;
   }
 
@@ -548,7 +548,7 @@
     const string codebase(XmlGetProperty(url_node, "codebase"));
     if (codebase.empty()) {
       LOG(ERROR) << "Omaha Response URL has empty codebase";
-      completer->set_code(kActionCodeOmahaResponseInvalid);
+      completer->set_code(kErrorCodeOmahaResponseInvalid);
       return false;
     }
     output_object->payload_urls.push_back(codebase);
@@ -567,7 +567,7 @@
   scoped_ptr_malloc<xmlXPathObject, ScopedPtrXmlXPathObjectFree>
       xpath_nodeset(GetNodeSet(doc, ConstXMLStr(kPackageNodeXPath)));
   if (!xpath_nodeset.get()) {
-    completer->set_code(kActionCodeOmahaResponseInvalid);
+    completer->set_code(kErrorCodeOmahaResponseInvalid);
     return false;
   }
 
@@ -586,7 +586,7 @@
   LOG(INFO) << "Omaha Response package name = " << package_name;
   if (package_name.empty()) {
     LOG(ERROR) << "Omaha Response has empty package name";
-    completer->set_code(kActionCodeOmahaResponseInvalid);
+    completer->set_code(kErrorCodeOmahaResponseInvalid);
     return false;
   }
 
@@ -602,7 +602,7 @@
   off_t size = ParseInt(XmlGetProperty(package_node, "size"));
   if (size <= 0) {
     LOG(ERROR) << "Omaha Response has invalid payload size: " << size;
-    completer->set_code(kActionCodeOmahaResponseInvalid);
+    completer->set_code(kErrorCodeOmahaResponseInvalid);
     return false;
   }
   output_object->size = size;
@@ -622,7 +622,7 @@
   scoped_ptr_malloc<xmlXPathObject, ScopedPtrXmlXPathObjectFree>
       xpath_nodeset(GetNodeSet(doc, ConstXMLStr(kActionNodeXPath)));
   if (!xpath_nodeset.get()) {
-    completer->set_code(kActionCodeOmahaResponseInvalid);
+    completer->set_code(kErrorCodeOmahaResponseInvalid);
     return false;
   }
 
@@ -647,14 +647,14 @@
 
   if (!pie_action_node) {
     LOG(ERROR) << "Omaha Response has no postinstall event action";
-    completer->set_code(kActionCodeOmahaResponseInvalid);
+    completer->set_code(kErrorCodeOmahaResponseInvalid);
     return false;
   }
 
   output_object->hash = XmlGetProperty(pie_action_node, kTagSha256);
   if (output_object->hash.empty()) {
     LOG(ERROR) << "Omaha Response has empty sha256 value";
-    completer->set_code(kActionCodeOmahaResponseInvalid);
+    completer->set_code(kErrorCodeOmahaResponseInvalid);
     return false;
   }
 
@@ -701,7 +701,7 @@
       LOG(INFO) << "Signalling Crash Reporter.";
       utils::ScheduleCrashReporterUpload();
     }
-    completer.set_code(kActionCodeSuccess);
+    completer.set_code(kErrorCodeSuccess);
     return;
   }
 
@@ -712,8 +712,8 @@
     if (code < 0 || code >= 1000) {
       code = 999;
     }
-    completer.set_code(static_cast<ActionExitCode>(
-        kActionCodeOmahaRequestHTTPResponseBase + code));
+    completer.set_code(static_cast<ErrorCode>(
+        kErrorCodeOmahaRequestHTTPResponseBase + code));
     return;
   }
 
@@ -723,8 +723,8 @@
   if (!doc.get()) {
     LOG(ERROR) << "Omaha response not valid XML";
     completer.set_code(response_buffer_.empty() ?
-                       kActionCodeOmahaRequestEmptyResponseError :
-                       kActionCodeOmahaRequestXMLParseError);
+                       kErrorCodeOmahaRequestEmptyResponseError :
+                       kErrorCodeOmahaRequestXMLParseError);
     return;
   }
 
@@ -741,7 +741,7 @@
   if (!HasOutputPipe()) {
     // Just set success to whether or not the http transfer succeeded,
     // which must be true at this point in the code.
-    completer.set_code(kActionCodeSuccess);
+    completer.set_code(kErrorCodeSuccess);
     return;
   }
 
@@ -752,7 +752,7 @@
   if (params_->update_disabled()) {
     LOG(INFO) << "Ignoring Omaha updates as updates are disabled by policy.";
     output_object.update_exists = false;
-    completer.set_code(kActionCodeOmahaUpdateIgnoredPerPolicy);
+    completer.set_code(kErrorCodeOmahaUpdateIgnoredPerPolicy);
     // Note: We could technically delete the UpdateFirstSeenAt state here.
     // If we do, it'll mean a device has to restart the UpdateFirstSeenAt
     // and thus help scattering take effect when the AU is turned on again.
@@ -766,7 +766,7 @@
   if (ShouldDeferDownload(&output_object)) {
     output_object.update_exists = false;
     LOG(INFO) << "Ignoring Omaha updates as updates are deferred by policy.";
-    completer.set_code(kActionCodeOmahaUpdateDeferredPerPolicy);
+    completer.set_code(kErrorCodeOmahaUpdateDeferredPerPolicy);
     return;
   }
 
@@ -783,7 +783,7 @@
     output_object.update_exists = false;
     LOG(INFO) << "Ignoring Omaha updates in order to backoff our retry "
                  "attempts";
-    completer.set_code(kActionCodeOmahaUpdateDeferredForBackoff);
+    completer.set_code(kErrorCodeOmahaUpdateDeferredForBackoff);
     return;
   }
 }
diff --git a/omaha_request_action.h b/omaha_request_action.h
index 528ce19..7a4d3f2 100644
--- a/omaha_request_action.h
+++ b/omaha_request_action.h
@@ -54,19 +54,19 @@
   OmahaEvent()
       : type(kTypeUnknown),
         result(kResultError),
-        error_code(kActionCodeError) {}
+        error_code(kErrorCodeError) {}
   explicit OmahaEvent(Type in_type)
       : type(in_type),
         result(kResultSuccess),
-        error_code(kActionCodeSuccess) {}
-  OmahaEvent(Type in_type, Result in_result, ActionExitCode in_error_code)
+        error_code(kErrorCodeSuccess) {}
+  OmahaEvent(Type in_type, Result in_result, ErrorCode in_error_code)
       : type(in_type),
         result(in_result),
         error_code(in_error_code) {}
 
   Type type;
   Result result;
-  ActionExitCode error_code;
+  ErrorCode error_code;
 };
 
 class NoneType;
diff --git a/omaha_request_action_unittest.cc b/omaha_request_action_unittest.cc
index c3a3f1b..8ae951e 100644
--- a/omaha_request_action_unittest.cc
+++ b/omaha_request_action_unittest.cc
@@ -130,26 +130,26 @@
  public:
   OmahaRequestActionTestProcessorDelegate()
       : loop_(NULL),
-        expected_code_(kActionCodeSuccess) {}
+        expected_code_(kErrorCodeSuccess) {}
   virtual ~OmahaRequestActionTestProcessorDelegate() {
   }
   virtual void ProcessingDone(const ActionProcessor* processor,
-                              ActionExitCode code) {
+                              ErrorCode code) {
     ASSERT_TRUE(loop_);
     g_main_loop_quit(loop_);
   }
 
   virtual void ActionCompleted(ActionProcessor* processor,
                                AbstractAction* action,
-                               ActionExitCode code) {
+                               ErrorCode code) {
     // make sure actions always succeed
     if (action->Type() == OmahaRequestAction::StaticType())
       EXPECT_EQ(expected_code_, code);
     else
-      EXPECT_EQ(kActionCodeSuccess, code);
+      EXPECT_EQ(kErrorCodeSuccess, code);
   }
   GMainLoop *loop_;
-  ActionExitCode expected_code_;
+  ErrorCode expected_code_;
 };
 
 gboolean StartProcessorInRunLoop(gpointer data) {
@@ -178,7 +178,7 @@
     has_input_object_ = HasInputObject();
     if (has_input_object_)
       omaha_response_ = GetInputObject();
-    processor_->ActionComplete(this, kActionCodeSuccess);
+    processor_->ActionComplete(this, kErrorCodeSuccess);
   }
   // Should never be called
   void TerminateProcessing() {
@@ -204,7 +204,7 @@
                      const string& http_response,
                      int fail_http_response_code,
                      bool ping_only,
-                     ActionExitCode expected_code,
+                     ErrorCode expected_code,
                      OmahaResponse* out_response,
                      vector<char>* out_post_data) {
   GMainLoop* loop = g_main_loop_new(g_main_context_default(), FALSE);
@@ -279,7 +279,7 @@
                       GetNoUpdateResponse(OmahaRequestParams::kAppId),
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       &response,
                       NULL));
   EXPECT_FALSE(response.update_exists);
@@ -302,7 +302,7 @@
                                         "20101020"),  // deadline
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       &response,
                       NULL));
   EXPECT_TRUE(response.update_exists);
@@ -335,7 +335,7 @@
                                         ""),  // deadline
                       -1,
                       false,  // ping_only
-                      kActionCodeOmahaUpdateIgnoredPerPolicy,
+                      kErrorCodeOmahaUpdateIgnoredPerPolicy,
                       &response,
                       NULL));
   EXPECT_FALSE(response.update_exists);
@@ -351,7 +351,7 @@
                       GetNoUpdateResponse(OmahaRequestParams::kAppId),
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       &response,
                       NULL));
   EXPECT_FALSE(response.update_exists);
@@ -389,7 +389,7 @@
                                          "7"), // max days to scatter
                       -1,
                       false,  // ping_only
-                      kActionCodeOmahaUpdateDeferredPerPolicy,
+                      kErrorCodeOmahaUpdateDeferredPerPolicy,
                       &response,
                       NULL));
   EXPECT_FALSE(response.update_exists);
@@ -430,7 +430,7 @@
                                          "7"), // max days to scatter
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       &response,
                       NULL));
   EXPECT_TRUE(response.update_exists);
@@ -471,7 +471,7 @@
                                          "0"), // max days to scatter
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       &response,
                       NULL));
   EXPECT_TRUE(response.update_exists);
@@ -513,7 +513,7 @@
                                          "7"), // max days to scatter
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       &response,
                       NULL));
 
@@ -558,7 +558,7 @@
                                          "7"), // max days to scatter
                       -1,
                       false,  // ping_only
-                      kActionCodeOmahaUpdateDeferredPerPolicy,
+                      kErrorCodeOmahaUpdateDeferredPerPolicy,
                       &response,
                       NULL));
 
@@ -605,7 +605,7 @@
                                          "7"), // max days to scatter
                       -1,
                       false,  // ping_only
-                      kActionCodeOmahaUpdateDeferredPerPolicy,
+                      kErrorCodeOmahaUpdateDeferredPerPolicy,
                       &response,
                       NULL));
 
@@ -650,7 +650,7 @@
                       "invalid xml>",
                       -1,
                       false,  // ping_only
-                      kActionCodeOmahaRequestXMLParseError,
+                      kErrorCodeOmahaRequestXMLParseError,
                       &response,
                       NULL));
   EXPECT_FALSE(response.update_exists);
@@ -664,7 +664,7 @@
                       "",
                       -1,
                       false,  // ping_only
-                      kActionCodeOmahaRequestEmptyResponseError,
+                      kErrorCodeOmahaRequestEmptyResponseError,
                       &response,
                       NULL));
   EXPECT_FALSE(response.update_exists);
@@ -682,7 +682,7 @@
       "<updatecheck/></app></response>",
       -1,
       false,  // ping_only
-      kActionCodeOmahaResponseInvalid,
+      kErrorCodeOmahaResponseInvalid,
       &response,
       NULL));
   EXPECT_FALSE(response.update_exists);
@@ -700,7 +700,7 @@
       "<updatecheck status=\"InvalidStatusTest\"/></app></response>",
       -1,
       false,  // ping_only
-      kActionCodeOmahaResponseInvalid,
+      kErrorCodeOmahaResponseInvalid,
       &response,
       NULL));
   EXPECT_FALSE(response.update_exists);
@@ -718,7 +718,7 @@
       "</app></response>",
       -1,
       false,  // ping_only
-      kActionCodeOmahaResponseInvalid,
+      kErrorCodeOmahaResponseInvalid,
       &response,
       NULL));
   EXPECT_FALSE(response.update_exists);
@@ -751,7 +751,7 @@
                               input_response,
                               -1,
                               false,  // ping_only
-                              kActionCodeSuccess,
+                              kErrorCodeSuccess,
                               &response,
                               NULL));
   EXPECT_TRUE(response.update_exists);
@@ -839,7 +839,7 @@
                       "invalid xml>",
                       -1,
                       false,  // ping_only
-                      kActionCodeOmahaRequestXMLParseError,
+                      kErrorCodeOmahaRequestXMLParseError,
                       &response,
                       &post_data));
   // convert post_data to string
@@ -871,7 +871,7 @@
                                         "&lt;20110101"),  // deadline
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       &response,
                       NULL));
 
@@ -898,7 +898,7 @@
                                         "deadline"),
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       &response,
                       NULL));
 
@@ -916,7 +916,7 @@
                                "invalid xml>",
                                -1,
                                false,  // ping_only
-                               kActionCodeOmahaRequestXMLParseError,
+                               kErrorCodeOmahaRequestXMLParseError,
                                NULL,  // response
                                &post_data));
   // convert post_data to string
@@ -943,7 +943,7 @@
                                "invalid xml>",
                                -1,
                                false,  // ping_only
-                               kActionCodeOmahaRequestXMLParseError,
+                               kErrorCodeOmahaRequestXMLParseError,
                                NULL,  // response
                                &post_data));
   // convert post_data to string
@@ -978,7 +978,7 @@
   TestEvent(kDefaultTestParams,
             new OmahaEvent(OmahaEvent::kTypeDownloadComplete,
                            OmahaEvent::kResultError,
-                           kActionCodeError),
+                           kErrorCodeError),
             "invalid xml>",
             &post_data);
   // convert post_data to string
@@ -988,7 +988,7 @@
       "errorcode=\"%d\"></event>\n",
       OmahaEvent::kTypeDownloadComplete,
       OmahaEvent::kResultError,
-      kActionCodeError);
+      kErrorCodeError);
   EXPECT_NE(post_str.find(expected_event), string::npos);
   EXPECT_EQ(post_str.find("updatecheck"), string::npos);
 }
@@ -1045,7 +1045,7 @@
                                  "invalid xml>",
                                  -1,
                                  false,  // ping_only
-                                 kActionCodeOmahaRequestXMLParseError,
+                                 kErrorCodeOmahaRequestXMLParseError,
                                  NULL,
                                  &post_data));
     // convert post_data to string
@@ -1082,7 +1082,7 @@
                                  "invalid xml>",
                                  -1,
                                  false,  // ping_only
-                                 kActionCodeOmahaRequestXMLParseError,
+                                 kErrorCodeOmahaRequestXMLParseError,
                                  NULL,
                                  &post_data));
     // convert post_data to string
@@ -1098,19 +1098,19 @@
   OmahaEvent default_event;
   EXPECT_EQ(OmahaEvent::kTypeUnknown, default_event.type);
   EXPECT_EQ(OmahaEvent::kResultError, default_event.result);
-  EXPECT_EQ(kActionCodeError, default_event.error_code);
+  EXPECT_EQ(kErrorCodeError, default_event.error_code);
 
   OmahaEvent success_event(OmahaEvent::kTypeUpdateDownloadStarted);
   EXPECT_EQ(OmahaEvent::kTypeUpdateDownloadStarted, success_event.type);
   EXPECT_EQ(OmahaEvent::kResultSuccess, success_event.result);
-  EXPECT_EQ(kActionCodeSuccess, success_event.error_code);
+  EXPECT_EQ(kErrorCodeSuccess, success_event.error_code);
 
   OmahaEvent error_event(OmahaEvent::kTypeUpdateDownloadFinished,
                          OmahaEvent::kResultError,
-                         kActionCodeError);
+                         kErrorCodeError);
   EXPECT_EQ(OmahaEvent::kTypeUpdateDownloadFinished, error_event.type);
   EXPECT_EQ(OmahaEvent::kResultError, error_event.result);
-  EXPECT_EQ(kActionCodeError, error_event.error_code);
+  EXPECT_EQ(kErrorCodeError, error_event.error_code);
 }
 
 TEST(OmahaRequestActionTest, PingTest) {
@@ -1132,7 +1132,7 @@
                         GetNoUpdateResponse(OmahaRequestParams::kAppId),
                         -1,
                         ping_only,
-                        kActionCodeSuccess,
+                        kErrorCodeSuccess,
                         NULL,
                         &post_data));
     string post_str(&post_data[0], post_data.size());
@@ -1164,7 +1164,7 @@
                       GetNoUpdateResponse(OmahaRequestParams::kAppId),
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       NULL,
                       &post_data));
   string post_str(&post_data[0], post_data.size());
@@ -1188,7 +1188,7 @@
                       GetNoUpdateResponse(OmahaRequestParams::kAppId),
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       NULL,
                       &post_data));
   string post_str(&post_data[0], post_data.size());
@@ -1213,7 +1213,7 @@
                       GetNoUpdateResponse(OmahaRequestParams::kAppId),
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       NULL,
                       &post_data));
   string post_str(&post_data[0], post_data.size());
@@ -1237,7 +1237,7 @@
                       GetNoUpdateResponse(OmahaRequestParams::kAppId),
                       -1,
                       true,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       NULL,
                       &post_data));
   EXPECT_EQ(post_data.size(), 0);
@@ -1265,7 +1265,7 @@
                       "<updatecheck status=\"noupdate\"/></app></response>",
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       NULL,
                       &post_data));
   string post_str(&post_data[0], post_data.size());
@@ -1297,7 +1297,7 @@
                       "<updatecheck status=\"noupdate\"/></app></response>",
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       NULL,
                       NULL));
 }
@@ -1315,7 +1315,7 @@
                       "<updatecheck status=\"noupdate\"/></app></response>",
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       NULL,
                       NULL));
 }
@@ -1333,7 +1333,7 @@
                       "<updatecheck status=\"noupdate\"/></app></response>",
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       NULL,
                       NULL));
 }
@@ -1345,7 +1345,7 @@
                                "invalid xml>",
                                -1,
                                false,  // ping_only
-                               kActionCodeOmahaRequestXMLParseError,
+                               kErrorCodeOmahaRequestXMLParseError,
                                NULL,  // response
                                &post_data));
   // convert post_data to string
@@ -1362,8 +1362,8 @@
                       "",
                       501,
                       false,  // ping_only
-                      static_cast<ActionExitCode>(
-                          kActionCodeOmahaRequestHTTPResponseBase + 501),
+                      static_cast<ErrorCode>(
+                          kErrorCodeOmahaRequestHTTPResponseBase + 501),
                       &response,
                       NULL));
   EXPECT_FALSE(response.update_exists);
@@ -1377,8 +1377,8 @@
                       "",
                       1500,
                       false,  // ping_only
-                      static_cast<ActionExitCode>(
-                          kActionCodeOmahaRequestHTTPResponseBase + 999),
+                      static_cast<ErrorCode>(
+                          kErrorCodeOmahaRequestHTTPResponseBase + 999),
                       &response,
                       NULL));
   EXPECT_FALSE(response.update_exists);
@@ -1416,7 +1416,7 @@
                                          "7"), // max days to scatter
                       -1,
                       false,  // ping_only
-                      kActionCodeOmahaUpdateDeferredPerPolicy,
+                      kErrorCodeOmahaUpdateDeferredPerPolicy,
                       &response,
                       NULL));
 
@@ -1463,7 +1463,7 @@
                                          "7"), // max days to scatter
                       -1,
                       false,  // ping_only
-                      kActionCodeSuccess,
+                      kErrorCodeSuccess,
                       &response,
                       NULL));
 
@@ -1504,7 +1504,7 @@
                                "invalid xml>",
                                -1,
                                false,  // ping_only
-                               kActionCodeOmahaRequestXMLParseError,
+                               kErrorCodeOmahaRequestXMLParseError,
                                NULL,  // response
                                &post_data));
   // convert post_data to string
@@ -1543,7 +1543,7 @@
                                "invalid xml>",
                                -1,
                                false,  // ping_only
-                               kActionCodeOmahaRequestXMLParseError,
+                               kErrorCodeOmahaRequestXMLParseError,
                                NULL,  // response
                                &post_data));
   // convert post_data to string
diff --git a/omaha_response_handler_action.cc b/omaha_response_handler_action.cc
index f494aa0..ad6a087 100644
--- a/omaha_response_handler_action.cc
+++ b/omaha_response_handler_action.cc
@@ -94,7 +94,7 @@
                    response.deadline.size());
   chmod(kDeadlineFile, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 
-  completer.set_code(kActionCodeSuccess);
+  completer.set_code(kErrorCodeSuccess);
 }
 
 bool OmahaResponseHandlerAction::GetInstallDev(const std::string& boot_dev,
diff --git a/omaha_response_handler_action_unittest.cc b/omaha_response_handler_action_unittest.cc
index cb27f82..15a1f06 100644
--- a/omaha_response_handler_action_unittest.cc
+++ b/omaha_response_handler_action_unittest.cc
@@ -35,17 +35,17 @@
     : public ActionProcessorDelegate {
  public:
   OmahaResponseHandlerActionProcessorDelegate()
-      : code_(kActionCodeError),
+      : code_(kErrorCodeError),
         code_set_(false) {}
   void ActionCompleted(ActionProcessor* processor,
                        AbstractAction* action,
-                       ActionExitCode code) {
+                       ErrorCode code) {
     if (action->Type() == OmahaResponseHandlerAction::StaticType()) {
       code_ = code;
       code_set_ = true;
     }
   }
-  ActionExitCode code_;
+  ErrorCode code_;
   bool code_set_;
 };
 
@@ -91,7 +91,7 @@
   if (out)
     *out = collector_action.object();
   EXPECT_TRUE(delegate.code_set_);
-  return delegate.code_ == kActionCodeSuccess;
+  return delegate.code_ == kErrorCodeSuccess;
 }
 
 bool OmahaResponseHandlerActionTest::DoTest(const OmahaResponse& in,
diff --git a/payload_signer.cc b/payload_signer.cc
index 26d63db..86114b2 100644
--- a/payload_signer.cc
+++ b/payload_signer.cc
@@ -164,7 +164,7 @@
   // Loads the payload and parses the manifest.
   TEST_AND_RETURN_FALSE(utils::ReadFile(payload_path, &payload));
   LOG(INFO) << "Payload size: " << payload.size();
-  ActionExitCode error = kActionCodeSuccess;
+  ErrorCode error = kErrorCodeSuccess;
   InstallPlan install_plan;
   DeltaPerformer delta_performer(NULL, NULL, &install_plan);
   TEST_AND_RETURN_FALSE(delta_performer.ParsePayloadMetadata(
diff --git a/payload_state.cc b/payload_state.cc
index 390dd6a..31c4e42 100644
--- a/payload_state.cc
+++ b/payload_state.cc
@@ -147,8 +147,8 @@
   ReportDurationMetrics();
 }
 
-void PayloadState::UpdateFailed(ActionExitCode error) {
-  ActionExitCode base_error = utils::GetBaseErrorCode(error);
+void PayloadState::UpdateFailed(ErrorCode error) {
+  ErrorCode base_error = utils::GetBaseErrorCode(error);
   LOG(INFO) << "Updating payload state for error code: " << base_error
             << " (" << utils::CodeToString(base_error) << ")";
 
@@ -164,24 +164,24 @@
     // the protocol used in the URL or entities in the communication channel
     // (e.g. proxies). We should try the next available URL in the next update
     // check to quickly recover from these errors.
-    case kActionCodePayloadHashMismatchError:
-    case kActionCodePayloadSizeMismatchError:
-    case kActionCodeDownloadPayloadVerificationError:
-    case kActionCodeDownloadPayloadPubKeyVerificationError:
-    case kActionCodeSignedDeltaPayloadExpectedError:
-    case kActionCodeDownloadInvalidMetadataMagicString:
-    case kActionCodeDownloadSignatureMissingInManifest:
-    case kActionCodeDownloadManifestParseError:
-    case kActionCodeDownloadMetadataSignatureError:
-    case kActionCodeDownloadMetadataSignatureVerificationError:
-    case kActionCodeDownloadMetadataSignatureMismatch:
-    case kActionCodeDownloadOperationHashVerificationError:
-    case kActionCodeDownloadOperationExecutionError:
-    case kActionCodeDownloadOperationHashMismatch:
-    case kActionCodeDownloadInvalidMetadataSize:
-    case kActionCodeDownloadInvalidMetadataSignature:
-    case kActionCodeDownloadOperationHashMissingError:
-    case kActionCodeDownloadMetadataSignatureMissingError:
+    case kErrorCodePayloadHashMismatchError:
+    case kErrorCodePayloadSizeMismatchError:
+    case kErrorCodeDownloadPayloadVerificationError:
+    case kErrorCodeDownloadPayloadPubKeyVerificationError:
+    case kErrorCodeSignedDeltaPayloadExpectedError:
+    case kErrorCodeDownloadInvalidMetadataMagicString:
+    case kErrorCodeDownloadSignatureMissingInManifest:
+    case kErrorCodeDownloadManifestParseError:
+    case kErrorCodeDownloadMetadataSignatureError:
+    case kErrorCodeDownloadMetadataSignatureVerificationError:
+    case kErrorCodeDownloadMetadataSignatureMismatch:
+    case kErrorCodeDownloadOperationHashVerificationError:
+    case kErrorCodeDownloadOperationExecutionError:
+    case kErrorCodeDownloadOperationHashMismatch:
+    case kErrorCodeDownloadInvalidMetadataSize:
+    case kErrorCodeDownloadInvalidMetadataSignature:
+    case kErrorCodeDownloadOperationHashMissingError:
+    case kErrorCodeDownloadMetadataSignatureMissingError:
       IncrementUrlIndex();
       break;
 
@@ -193,11 +193,11 @@
     // (because download from a local server URL that appears earlier in a
     // response is preferable than downloading from the next URL which could be
     // a internet URL and thus could be more expensive).
-    case kActionCodeError:
-    case kActionCodeDownloadTransferError:
-    case kActionCodeDownloadWriteError:
-    case kActionCodeDownloadStateInitializationError:
-    case kActionCodeOmahaErrorInHTTPResponse: // Aggregate code for HTTP errors.
+    case kErrorCodeError:
+    case kErrorCodeDownloadTransferError:
+    case kErrorCodeDownloadWriteError:
+    case kErrorCodeDownloadStateInitializationError:
+    case kErrorCodeOmahaErrorInHTTPResponse: // Aggregate code for HTTP errors.
       IncrementFailureCount();
       break;
 
@@ -210,36 +210,36 @@
     // payload attempt number would have been incremented and would take care
     // of the backoff at the next update check.
     // In either case, there's no need to update URL index or failure count.
-    case kActionCodeOmahaRequestError:
-    case kActionCodeOmahaResponseHandlerError:
-    case kActionCodePostinstallRunnerError:
-    case kActionCodeFilesystemCopierError:
-    case kActionCodeInstallDeviceOpenError:
-    case kActionCodeKernelDeviceOpenError:
-    case kActionCodeDownloadNewPartitionInfoError:
-    case kActionCodeNewRootfsVerificationError:
-    case kActionCodeNewKernelVerificationError:
-    case kActionCodePostinstallBootedFromFirmwareB:
-    case kActionCodeOmahaRequestEmptyResponseError:
-    case kActionCodeOmahaRequestXMLParseError:
-    case kActionCodeOmahaResponseInvalid:
-    case kActionCodeOmahaUpdateIgnoredPerPolicy:
-    case kActionCodeOmahaUpdateDeferredPerPolicy:
-    case kActionCodeOmahaUpdateDeferredForBackoff:
-    case kActionCodePostinstallPowerwashError:
-    case kActionCodeUpdateCanceledByChannelChange:
+    case kErrorCodeOmahaRequestError:
+    case kErrorCodeOmahaResponseHandlerError:
+    case kErrorCodePostinstallRunnerError:
+    case kErrorCodeFilesystemCopierError:
+    case kErrorCodeInstallDeviceOpenError:
+    case kErrorCodeKernelDeviceOpenError:
+    case kErrorCodeDownloadNewPartitionInfoError:
+    case kErrorCodeNewRootfsVerificationError:
+    case kErrorCodeNewKernelVerificationError:
+    case kErrorCodePostinstallBootedFromFirmwareB:
+    case kErrorCodeOmahaRequestEmptyResponseError:
+    case kErrorCodeOmahaRequestXMLParseError:
+    case kErrorCodeOmahaResponseInvalid:
+    case kErrorCodeOmahaUpdateIgnoredPerPolicy:
+    case kErrorCodeOmahaUpdateDeferredPerPolicy:
+    case kErrorCodeOmahaUpdateDeferredForBackoff:
+    case kErrorCodePostinstallPowerwashError:
+    case kErrorCodeUpdateCanceledByChannelChange:
       LOG(INFO) << "Not incrementing URL index or failure count for this error";
       break;
 
-    case kActionCodeSuccess:                            // success code
-    case kActionCodeSetBootableFlagError:               // unused
-    case kActionCodeUmaReportedMax:                     // not an error code
-    case kActionCodeOmahaRequestHTTPResponseBase:       // aggregated already
-    case kActionCodeDevModeFlag:                       // not an error code
-    case kActionCodeResumedFlag:                        // not an error code
-    case kActionCodeTestImageFlag:                      // not an error code
-    case kActionCodeTestOmahaUrlFlag:                   // not an error code
-    case kSpecialFlags:                                 // not an error code
+    case kErrorCodeSuccess:                            // success code
+    case kErrorCodeSetBootableFlagError:               // unused
+    case kErrorCodeUmaReportedMax:                     // not an error code
+    case kErrorCodeOmahaRequestHTTPResponseBase:       // aggregated already
+    case kErrorCodeDevModeFlag:                       // not an error code
+    case kErrorCodeResumedFlag:                        // not an error code
+    case kErrorCodeTestImageFlag:                      // not an error code
+    case kErrorCodeTestOmahaUrlFlag:                   // not an error code
+    case kErrorCodeSpecialFlags:                       // not an error code
       // These shouldn't happen. Enumerating these  explicitly here so that we
       // can let the compiler warn about new error codes that are added to
       // action_processor.h but not added here.
diff --git a/payload_state.h b/payload_state.h
index b12e6b0..1b0899c 100644
--- a/payload_state.h
+++ b/payload_state.h
@@ -38,7 +38,7 @@
   virtual void UpdateResumed();
   virtual void UpdateRestarted();
   virtual void UpdateSucceeded();
-  virtual void UpdateFailed(ActionExitCode error);
+  virtual void UpdateFailed(ErrorCode error);
   virtual bool ShouldBackoffDownload();
 
   virtual inline std::string GetResponseSignature() {
diff --git a/payload_state_interface.h b/payload_state_interface.h
index e092290..205cb91 100644
--- a/payload_state_interface.h
+++ b/payload_state_interface.h
@@ -56,7 +56,7 @@
   // This method should be called whenever an update attempt fails with the
   // given error code. We use this notification to update the payload state
   // depending on the type of the error that happened.
-  virtual void UpdateFailed(ActionExitCode error) = 0;
+  virtual void UpdateFailed(ErrorCode error) = 0;
 
   // Returns true if we should backoff the current download attempt.
   // False otherwise.
diff --git a/payload_state_unittest.cc b/payload_state_unittest.cc
index 28017dc..f7688c2 100644
--- a/payload_state_unittest.cc
+++ b/payload_state_unittest.cc
@@ -73,13 +73,13 @@
 
 class PayloadStateTest : public ::testing::Test { };
 
-TEST(PayloadStateTest, DidYouAddANewActionExitCode) {
-  if (kActionCodeUmaReportedMax != 43) {
+TEST(PayloadStateTest, DidYouAddANewErrorCode) {
+  if (kErrorCodeUmaReportedMax != 43) {
     LOG(ERROR) << "The following failure is intentional. If you added a new "
-               << "ActionExitCode enum value, make sure to add it to the "
+               << "ErrorCode enum value, make sure to add it to the "
                << "PayloadState::UpdateFailed method and then update this test "
-               << "to the new value of kActionCodeUmaReportedMax, which is "
-               << kActionCodeUmaReportedMax;
+               << "to the new value of kErrorCodeUmaReportedMax, which is "
+               << kErrorCodeUmaReportedMax;
     EXPECT_FALSE("Please see the log line above");
   }
 }
@@ -248,7 +248,7 @@
   EXPECT_EQ(0, payload_state.GetUrlIndex());
 
   // Verify that on the first error, the URL index advances to 1.
-  ActionExitCode error = kActionCodeDownloadMetadataSignatureMismatch;
+  ErrorCode error = kErrorCodeDownloadMetadataSignatureMismatch;
   payload_state.UpdateFailed(error);
   EXPECT_EQ(1, payload_state.GetUrlIndex());
 
@@ -275,7 +275,7 @@
   SetupPayloadStateWith2Urls("Hash5823", &payload_state, &response);
 
   // Advance the URL index to 1 by faking an error.
-  ActionExitCode error = kActionCodeDownloadMetadataSignatureMismatch;
+  ErrorCode error = kErrorCodeDownloadMetadataSignatureMismatch;
   payload_state.UpdateFailed(error);
   EXPECT_EQ(1, payload_state.GetUrlIndex());
   EXPECT_EQ(1, payload_state.GetUrlSwitchCount());
@@ -345,21 +345,21 @@
   SetupPayloadStateWith2Urls("Hash5873", &payload_state, &response);
 
   // This should advance the URL index.
-  payload_state.UpdateFailed(kActionCodeDownloadMetadataSignatureMismatch);
+  payload_state.UpdateFailed(kErrorCodeDownloadMetadataSignatureMismatch);
   EXPECT_EQ(0, payload_state.GetPayloadAttemptNumber());
   EXPECT_EQ(1, payload_state.GetUrlIndex());
   EXPECT_EQ(0, payload_state.GetUrlFailureCount());
   EXPECT_EQ(1, payload_state.GetUrlSwitchCount());
 
   // This should advance the failure count only.
-  payload_state.UpdateFailed(kActionCodeDownloadTransferError);
+  payload_state.UpdateFailed(kErrorCodeDownloadTransferError);
   EXPECT_EQ(0, payload_state.GetPayloadAttemptNumber());
   EXPECT_EQ(1, payload_state.GetUrlIndex());
   EXPECT_EQ(1, payload_state.GetUrlFailureCount());
   EXPECT_EQ(1, payload_state.GetUrlSwitchCount());
 
   // This should advance the failure count only.
-  payload_state.UpdateFailed(kActionCodeDownloadTransferError);
+  payload_state.UpdateFailed(kErrorCodeDownloadTransferError);
   EXPECT_EQ(0, payload_state.GetPayloadAttemptNumber());
   EXPECT_EQ(1, payload_state.GetUrlIndex());
   EXPECT_EQ(2, payload_state.GetUrlFailureCount());
@@ -369,7 +369,7 @@
   // max failure count and reset the failure count for the new URL index.
   // This should also wrap around the URL index and thus cause the payload
   // attempt number to be incremented.
-  payload_state.UpdateFailed(kActionCodeDownloadTransferError);
+  payload_state.UpdateFailed(kErrorCodeDownloadTransferError);
   EXPECT_EQ(1, payload_state.GetPayloadAttemptNumber());
   EXPECT_EQ(0, payload_state.GetUrlIndex());
   EXPECT_EQ(0, payload_state.GetUrlFailureCount());
@@ -377,7 +377,7 @@
   EXPECT_TRUE(payload_state.ShouldBackoffDownload());
 
   // This should advance the URL index.
-  payload_state.UpdateFailed(kActionCodePayloadHashMismatchError);
+  payload_state.UpdateFailed(kErrorCodePayloadHashMismatchError);
   EXPECT_EQ(1, payload_state.GetPayloadAttemptNumber());
   EXPECT_EQ(1, payload_state.GetUrlIndex());
   EXPECT_EQ(0, payload_state.GetUrlFailureCount());
@@ -386,7 +386,7 @@
 
   // This should advance the URL index and payload attempt number due to
   // wrap-around of URL index.
-  payload_state.UpdateFailed(kActionCodeDownloadMetadataSignatureMissingError);
+  payload_state.UpdateFailed(kErrorCodeDownloadMetadataSignatureMissingError);
   EXPECT_EQ(2, payload_state.GetPayloadAttemptNumber());
   EXPECT_EQ(0, payload_state.GetUrlIndex());
   EXPECT_EQ(0, payload_state.GetUrlFailureCount());
@@ -394,8 +394,8 @@
   EXPECT_TRUE(payload_state.ShouldBackoffDownload());
 
   // This HTTP error code should only increase the failure count.
-  payload_state.UpdateFailed(static_cast<ActionExitCode>(
-      kActionCodeOmahaRequestHTTPResponseBase + 404));
+  payload_state.UpdateFailed(static_cast<ErrorCode>(
+      kErrorCodeOmahaRequestHTTPResponseBase + 404));
   EXPECT_EQ(2, payload_state.GetPayloadAttemptNumber());
   EXPECT_EQ(0, payload_state.GetUrlIndex());
   EXPECT_EQ(1, payload_state.GetUrlFailureCount());
@@ -466,8 +466,8 @@
   // Generate enough events to advance URL index, failure count and
   // payload attempt number all to 1.
   payload_state.DownloadComplete();
-  payload_state.UpdateFailed(kActionCodeDownloadMetadataSignatureMismatch);
-  payload_state.UpdateFailed(kActionCodeDownloadTransferError);
+  payload_state.UpdateFailed(kErrorCodeDownloadMetadataSignatureMismatch);
+  payload_state.UpdateFailed(kErrorCodeDownloadTransferError);
   EXPECT_EQ(1, payload_state.GetPayloadAttemptNumber());
   EXPECT_EQ(1, payload_state.GetUrlIndex());
   EXPECT_EQ(1, payload_state.GetUrlFailureCount());
@@ -522,8 +522,8 @@
   // Simulate two failures (enough to cause payload backoff) and check
   // again that we're ready to re-download without any backoff as this is
   // a delta payload.
-  payload_state.UpdateFailed(kActionCodeDownloadMetadataSignatureMismatch);
-  payload_state.UpdateFailed(kActionCodeDownloadMetadataSignatureMismatch);
+  payload_state.UpdateFailed(kErrorCodeDownloadMetadataSignatureMismatch);
+  payload_state.UpdateFailed(kErrorCodeDownloadMetadataSignatureMismatch);
   EXPECT_EQ(0, payload_state.GetUrlIndex());
   EXPECT_EQ(0, payload_state.GetPayloadAttemptNumber());
   EXPECT_FALSE(payload_state.ShouldBackoffDownload());
@@ -585,8 +585,8 @@
   // Test again, this time by simulating two errors that would cause
   // the payload attempt number to increment due to wrap around. And
   // check that we are still ready to re-download without any backoff.
-  payload_state.UpdateFailed(kActionCodeDownloadMetadataSignatureMismatch);
-  payload_state.UpdateFailed(kActionCodeDownloadMetadataSignatureMismatch);
+  payload_state.UpdateFailed(kErrorCodeDownloadMetadataSignatureMismatch);
+  payload_state.UpdateFailed(kErrorCodeDownloadMetadataSignatureMismatch);
   EXPECT_EQ(2, payload_state.GetPayloadAttemptNumber());
   EXPECT_FALSE(payload_state.ShouldBackoffDownload());
 }
@@ -618,7 +618,7 @@
             payload_state.GetTotalBytesDownloaded(kDownloadSourceHttpsServer));
 
   // Simulate an error that'll cause the url index to point to https.
-  ActionExitCode error = kActionCodeDownloadMetadataSignatureMismatch;
+  ErrorCode error = kErrorCodeDownloadMetadataSignatureMismatch;
   payload_state.UpdateFailed(error);
 
   // Test that no new progress is made on HTTP and new progress is on HTTPs.
diff --git a/postinstall_runner_action.cc b/postinstall_runner_action.cc
index 802a2cd..20dfae9 100644
--- a/postinstall_runner_action.cc
+++ b/postinstall_runner_action.cc
@@ -59,7 +59,7 @@
     if (utils::CreatePowerwashMarkerFile()) {
       powerwash_marker_created_ = true;
     } else {
-      completer.set_code(kActionCodePostinstallPowerwashError);
+      completer.set_code(kErrorCodePostinstallPowerwashError);
       return;
     }
   }
@@ -88,7 +88,7 @@
       // This special return code means that we tried to update firmware,
       // but couldn't because we booted from FW B, and we need to reboot
       // to get back to FW A.
-      completer.set_code(kActionCodePostinstallBootedFromFirmwareB);
+      completer.set_code(kErrorCodePostinstallBootedFromFirmwareB);
     }
     return;
   }
@@ -100,7 +100,7 @@
   if (HasOutputPipe())
     SetOutputObject(install_plan);
 
-  completer.set_code(kActionCodeSuccess);
+  completer.set_code(kErrorCodeSuccess);
 }
 
 void PostinstallRunnerAction::StaticCompletePostinstall(int return_code,
diff --git a/postinstall_runner_action_unittest.cc b/postinstall_runner_action_unittest.cc
index 85954dd..fdde180 100644
--- a/postinstall_runner_action_unittest.cc
+++ b/postinstall_runner_action_unittest.cc
@@ -44,23 +44,23 @@
  public:
   PostinstActionProcessorDelegate()
       : loop_(NULL),
-        code_(kActionCodeError),
+        code_(kErrorCodeError),
         code_set_(false) {}
   void ProcessingDone(const ActionProcessor* processor,
-                      ActionExitCode code) {
+                      ErrorCode code) {
     ASSERT_TRUE(loop_);
     g_main_loop_quit(loop_);
   }
   void ActionCompleted(ActionProcessor* processor,
                        AbstractAction* action,
-                       ActionExitCode code) {
+                       ErrorCode code) {
     if (action->Type() == PostinstallRunnerAction::StaticType()) {
       code_ = code;
       code_set_ = true;
     }
   }
   GMainLoop* loop_;
-  ActionExitCode code_;
+  ErrorCode code_;
   bool code_set_;
 };
 
@@ -171,7 +171,7 @@
   ASSERT_FALSE(processor.IsRunning());
 
   EXPECT_TRUE(delegate.code_set_);
-  EXPECT_EQ(should_succeed, delegate.code_ == kActionCodeSuccess);
+  EXPECT_EQ(should_succeed, delegate.code_ == kErrorCodeSuccess);
   EXPECT_EQ(should_succeed, !collector_action.object().install_path.empty());
   if (should_succeed)
     EXPECT_TRUE(install_plan == collector_action.object());
@@ -187,7 +187,7 @@
   }
 
   if (err_code == 2)
-    EXPECT_EQ(kActionCodePostinstallBootedFromFirmwareB, delegate.code_);
+    EXPECT_EQ(kErrorCodePostinstallBootedFromFirmwareB, delegate.code_);
 
   struct stat stbuf;
   int rc = lstat((string(cwd) + "/postinst_called").c_str(), &stbuf);
diff --git a/test_utils.h b/test_utils.h
index 30f1f89..e8f337d 100644
--- a/test_utils.h
+++ b/test_utils.h
@@ -195,7 +195,7 @@
     if (this->HasOutputPipe()) {
       this->SetOutputObject(out_obj_);
     }
-    this->processor_->ActionComplete(this, kActionCodeSuccess);
+    this->processor_->ActionComplete(this, kErrorCodeSuccess);
   }
   static std::string StaticType() { return "ObjectFeederAction"; }
   std::string Type() const { return StaticType(); }
@@ -229,7 +229,7 @@
     if (this->HasInputObject()) {
       object_ = this->GetInputObject();
     }
-    this->processor_->ActionComplete(this, kActionCodeSuccess);
+    this->processor_->ActionComplete(this, kErrorCodeSuccess);
   }
   static std::string StaticType() { return "ObjectCollectorAction"; }
   std::string Type() const { return StaticType(); }
diff --git a/update_attempter.cc b/update_attempter.cc
index 60276dd..3aa6a1e 100644
--- a/update_attempter.cc
+++ b/update_attempter.cc
@@ -82,24 +82,24 @@
   }
 }
 
-// Turns a generic kActionCodeError to a generic error code specific
-// to |action| (e.g., kActionCodeFilesystemCopierError). If |code| is
-// not kActionCodeError, or the action is not matched, returns |code|
+// Turns a generic kErrorCodeError to a generic error code specific
+// to |action| (e.g., kErrorCodeFilesystemCopierError). If |code| is
+// not kErrorCodeError, or the action is not matched, returns |code|
 // unchanged.
-ActionExitCode GetErrorCodeForAction(AbstractAction* action,
-                                     ActionExitCode code) {
-  if (code != kActionCodeError)
+ErrorCode GetErrorCodeForAction(AbstractAction* action,
+                                     ErrorCode code) {
+  if (code != kErrorCodeError)
     return code;
 
   const string type = action->Type();
   if (type == OmahaRequestAction::StaticType())
-    return kActionCodeOmahaRequestError;
+    return kErrorCodeOmahaRequestError;
   if (type == OmahaResponseHandlerAction::StaticType())
-    return kActionCodeOmahaResponseHandlerError;
+    return kErrorCodeOmahaResponseHandlerError;
   if (type == FilesystemCopierAction::StaticType())
-    return kActionCodeFilesystemCopierError;
+    return kErrorCodeFilesystemCopierError;
   if (type == PostinstallRunnerAction::StaticType())
-    return kActionCodePostinstallRunnerError;
+    return kErrorCodePostinstallRunnerError;
 
   return code;
 }
@@ -573,7 +573,7 @@
 
 // Delegate methods:
 void UpdateAttempter::ProcessingDone(const ActionProcessor* processor,
-                                     ActionExitCode code) {
+                                     ErrorCode code) {
   CHECK(response_handler_action_);
   LOG(INFO) << "Processing Done.";
   actions_.clear();
@@ -597,7 +597,7 @@
         "so requesting reboot from user.";
   }
 
-  if (code == kActionCodeSuccess) {
+  if (code == kErrorCodeSuccess) {
     utils::WriteFile(kUpdateCompletedMarker, "", 0);
     prefs_->SetInt64(kPrefsDeltaUpdateFailures, 0);
     prefs_->SetString(kPrefsPreviousVersion,
@@ -649,7 +649,7 @@
 // or otherwise.
 void UpdateAttempter::ActionCompleted(ActionProcessor* processor,
                                       AbstractAction* action,
-                                      ActionExitCode code) {
+                                      ErrorCode code) {
   // Reset download progress regardless of whether or not the download
   // action succeeded. Also, get the response code from HTTP request
   // actions (update download as well as the initial update check
@@ -673,12 +673,12 @@
       }
     }
   }
-  if (code != kActionCodeSuccess) {
+  if (code != kErrorCodeSuccess) {
     // If the current state is at or past the download phase, count the failure
     // in case a switch to full update becomes necessary. Ignore network
     // transfer timeouts and failures.
     if (status_ >= UPDATE_STATUS_DOWNLOADING &&
-        code != kActionCodeDownloadTransferError) {
+        code != kErrorCodeDownloadTransferError) {
       MarkDeltaUpdateFailure();
     }
     // On failure, schedule an error event to be sent to Omaha.
@@ -842,22 +842,22 @@
   uint32_t flags = 0;
 
   if (!utils::IsNormalBootMode())
-    flags |= kActionCodeDevModeFlag;
+    flags |= kErrorCodeDevModeFlag;
 
   if (response_handler_action_.get() &&
       response_handler_action_->install_plan().is_resume)
-    flags |= kActionCodeResumedFlag;
+    flags |= kErrorCodeResumedFlag;
 
   if (!utils::IsOfficialBuild())
-    flags |= kActionCodeTestImageFlag;
+    flags |= kErrorCodeTestImageFlag;
 
   if (omaha_request_params_->update_url() != kProductionOmahaUrl)
-    flags |= kActionCodeTestOmahaUrlFlag;
+    flags |= kErrorCodeTestOmahaUrlFlag;
 
   return flags;
 }
 
-bool UpdateAttempter::ShouldCancel(ActionExitCode* cancel_reason) {
+bool UpdateAttempter::ShouldCancel(ErrorCode* cancel_reason) {
   // Check if the channel we're attempting to update to is the same as the
   // target channel currently chosen by the user.
   OmahaRequestParams* params = system_state_->request_params();
@@ -866,7 +866,7 @@
                << params->target_channel()
                << " is different from the download channel: "
                << params->download_channel();
-    *cancel_reason = kActionCodeUpdateCanceledByChannelChange;
+    *cancel_reason = kErrorCodeUpdateCanceledByChannelChange;
     return true;
   }
 
@@ -883,7 +883,7 @@
 }
 
 void UpdateAttempter::CreatePendingErrorEvent(AbstractAction* action,
-                                              ActionExitCode code) {
+                                              ErrorCode code) {
   if (error_event_.get()) {
     // This shouldn't really happen.
     LOG(WARNING) << "There's already an existing pending error event.";
@@ -895,7 +895,7 @@
   // failure has not occurred while sending an error event -- in which case
   // don't schedule another. This shouldn't really happen but just in case...
   if ((action->Type() == OmahaResponseHandlerAction::StaticType() &&
-       code == kActionCodeError) ||
+       code == kErrorCodeError) ||
       status_ == UPDATE_STATUS_REPORTING_ERROR_EVENT) {
     return;
   }
@@ -907,9 +907,9 @@
   // the switch cases below.
   OmahaEvent::Result event_result;
   switch (code) {
-    case kActionCodeOmahaUpdateIgnoredPerPolicy:
-    case kActionCodeOmahaUpdateDeferredPerPolicy:
-    case kActionCodeOmahaUpdateDeferredForBackoff:
+    case kErrorCodeOmahaUpdateIgnoredPerPolicy:
+    case kErrorCodeOmahaUpdateDeferredPerPolicy:
+    case kErrorCodeOmahaUpdateDeferredForBackoff:
       event_result = OmahaEvent::kResultUpdateDeferred;
       break;
     default:
@@ -918,10 +918,10 @@
   }
 
   code = GetErrorCodeForAction(action, code);
-  fake_update_success_ = code == kActionCodePostinstallBootedFromFirmwareB;
+  fake_update_success_ = code == kErrorCodePostinstallBootedFromFirmwareB;
 
   // Compute the final error code with all the bit flags to be sent to Omaha.
-  code = static_cast<ActionExitCode>(code | GetErrorCodeFlags());
+  code = static_cast<ErrorCode>(code | GetErrorCodeFlags());
   error_event_.reset(new OmahaEvent(OmahaEvent::kTypeUpdateComplete,
                                     event_result,
                                     code));
diff --git a/update_attempter.h b/update_attempter.h
index bcd730f..315e545 100644
--- a/update_attempter.h
+++ b/update_attempter.h
@@ -79,11 +79,11 @@
                       bool is_test_mode);
 
   // ActionProcessorDelegate methods:
-  void ProcessingDone(const ActionProcessor* processor, ActionExitCode code);
+  void ProcessingDone(const ActionProcessor* processor, ErrorCode code);
   void ProcessingStopped(const ActionProcessor* processor);
   void ActionCompleted(ActionProcessor* processor,
                        AbstractAction* action,
-                       ActionExitCode code);
+                       ErrorCode code);
 
   // Stop updating. An attempt will be made to record status to the disk
   // so that updates can be resumed later.
@@ -153,7 +153,7 @@
   // Broadcasts the current status over D-Bus.
   void BroadcastStatus();
 
-  // Returns the special flags to be added to ActionExitCode values based on the
+  // Returns the special flags to be added to ErrorCode values based on the
   // parameters used in the current update attempt.
   uint32_t GetErrorCodeFlags();
 
@@ -161,7 +161,7 @@
   // current state of the system, in which case |cancel_reason| indicates the
   // reason for the cancellation.  False otherwise, in which case
   // |cancel_reason| is untouched.
-  bool ShouldCancel(ActionExitCode* cancel_reason);
+  bool ShouldCancel(ErrorCode* cancel_reason);
 
  private:
   // Update server URL for automated lab test.
@@ -191,7 +191,7 @@
 
   // Creates an error event object in |error_event_| to be included in an
   // OmahaRequestAction once the current action processor is done.
-  void CreatePendingErrorEvent(AbstractAction* action, ActionExitCode code);
+  void CreatePendingErrorEvent(AbstractAction* action, ErrorCode code);
 
   // If there's a pending error event allocated in |error_event_|, schedules an
   // OmahaRequestAction with that event in the current processor, clears the
diff --git a/update_attempter_unittest.cc b/update_attempter_unittest.cc
index 042690f..ff3236c 100644
--- a/update_attempter_unittest.cc
+++ b/update_attempter_unittest.cc
@@ -116,7 +116,7 @@
   fetcher->FailTransfer(503);  // Sets the HTTP response code.
   DownloadAction action(prefs_, NULL, fetcher.release());
   EXPECT_CALL(*prefs_, GetInt64(kPrefsDeltaUpdateFailures, _)).Times(0);
-  attempter_.ActionCompleted(NULL, &action, kActionCodeSuccess);
+  attempter_.ActionCompleted(NULL, &action, kErrorCodeSuccess);
   EXPECT_EQ(503, attempter_.http_response_code());
   EXPECT_EQ(UPDATE_STATUS_FINALIZING, attempter_.status());
   ASSERT_TRUE(attempter_.error_event_.get() == NULL);
@@ -128,7 +128,7 @@
   attempter_.status_ = UPDATE_STATUS_DOWNLOADING;
   EXPECT_CALL(*prefs_, GetInt64(kPrefsDeltaUpdateFailures, _))
       .WillOnce(Return(false));
-  attempter_.ActionCompleted(NULL, &action, kActionCodeError);
+  attempter_.ActionCompleted(NULL, &action, kErrorCodeError);
   ASSERT_TRUE(attempter_.error_event_.get() != NULL);
 }
 
@@ -145,7 +145,7 @@
   UpdateCheckScheduler scheduler(&attempter_, &mock_system_state_);
   attempter_.set_update_check_scheduler(&scheduler);
   EXPECT_CALL(*prefs_, GetInt64(kPrefsDeltaUpdateFailures, _)).Times(0);
-  attempter_.ActionCompleted(NULL, &action, kActionCodeSuccess);
+  attempter_.ActionCompleted(NULL, &action, kErrorCodeSuccess);
   EXPECT_EQ(500, attempter_.http_response_code());
   EXPECT_EQ(UPDATE_STATUS_IDLE, attempter_.status());
   EXPECT_EQ(234, scheduler.poll_interval());
@@ -162,31 +162,31 @@
 }
 
 TEST_F(UpdateAttempterTest, GetErrorCodeForActionTest) {
-  extern ActionExitCode GetErrorCodeForAction(AbstractAction* action,
-                                              ActionExitCode code);
-  EXPECT_EQ(kActionCodeSuccess,
-            GetErrorCodeForAction(NULL, kActionCodeSuccess));
+  extern ErrorCode GetErrorCodeForAction(AbstractAction* action,
+                                              ErrorCode code);
+  EXPECT_EQ(kErrorCodeSuccess,
+            GetErrorCodeForAction(NULL, kErrorCodeSuccess));
 
   MockSystemState mock_system_state;
   OmahaRequestAction omaha_request_action(&mock_system_state, NULL,
                                           NULL, false);
-  EXPECT_EQ(kActionCodeOmahaRequestError,
-            GetErrorCodeForAction(&omaha_request_action, kActionCodeError));
+  EXPECT_EQ(kErrorCodeOmahaRequestError,
+            GetErrorCodeForAction(&omaha_request_action, kErrorCodeError));
   OmahaResponseHandlerAction omaha_response_handler_action(&mock_system_state_);
-  EXPECT_EQ(kActionCodeOmahaResponseHandlerError,
+  EXPECT_EQ(kErrorCodeOmahaResponseHandlerError,
             GetErrorCodeForAction(&omaha_response_handler_action,
-                                  kActionCodeError));
+                                  kErrorCodeError));
   FilesystemCopierAction filesystem_copier_action(false, false);
-  EXPECT_EQ(kActionCodeFilesystemCopierError,
-            GetErrorCodeForAction(&filesystem_copier_action, kActionCodeError));
+  EXPECT_EQ(kErrorCodeFilesystemCopierError,
+            GetErrorCodeForAction(&filesystem_copier_action, kErrorCodeError));
   PostinstallRunnerAction postinstall_runner_action;
-  EXPECT_EQ(kActionCodePostinstallRunnerError,
+  EXPECT_EQ(kErrorCodePostinstallRunnerError,
             GetErrorCodeForAction(&postinstall_runner_action,
-                                  kActionCodeError));
+                                  kErrorCodeError));
   ActionMock action_mock;
   EXPECT_CALL(action_mock, Type()).Times(1).WillOnce(Return("ActionMock"));
-  EXPECT_EQ(kActionCodeError,
-            GetErrorCodeForAction(&action_mock, kActionCodeError));
+  EXPECT_EQ(kErrorCodeError,
+            GetErrorCodeForAction(&action_mock, kErrorCodeError));
 }
 
 TEST_F(UpdateAttempterTest, DisableDeltaUpdateIfNeededTest) {
@@ -250,7 +250,7 @@
                                      OmahaRequestAction::StaticType())))
       .Times(1);
   EXPECT_CALL(*processor_, StartProcessing()).Times(1);
-  ActionExitCode err = kActionCodeError;
+  ErrorCode err = kErrorCodeError;
   EXPECT_CALL(*mock_system_state_.mock_payload_state(), UpdateFailed(err));
   attempter_.error_event_.reset(new OmahaEvent(OmahaEvent::kTypeUpdateComplete,
                                                OmahaEvent::kResultError,
@@ -427,12 +427,12 @@
 
 TEST_F(UpdateAttempterTest, CreatePendingErrorEventTest) {
   ActionMock action;
-  const ActionExitCode kCode = kActionCodeDownloadTransferError;
+  const ErrorCode kCode = kErrorCodeDownloadTransferError;
   attempter_.CreatePendingErrorEvent(&action, kCode);
   ASSERT_TRUE(attempter_.error_event_.get() != NULL);
   EXPECT_EQ(OmahaEvent::kTypeUpdateComplete, attempter_.error_event_->type);
   EXPECT_EQ(OmahaEvent::kResultError, attempter_.error_event_->result);
-  EXPECT_EQ(kCode | kActionCodeTestOmahaUrlFlag,
+  EXPECT_EQ(kCode | kErrorCodeTestOmahaUrlFlag,
             attempter_.error_event_->error_code);
 }
 
@@ -442,12 +442,12 @@
   response_action->install_plan_.is_resume = true;
   attempter_.response_handler_action_.reset(response_action);
   ActionMock action;
-  const ActionExitCode kCode = kActionCodeInstallDeviceOpenError;
+  const ErrorCode kCode = kErrorCodeInstallDeviceOpenError;
   attempter_.CreatePendingErrorEvent(&action, kCode);
   ASSERT_TRUE(attempter_.error_event_.get() != NULL);
   EXPECT_EQ(OmahaEvent::kTypeUpdateComplete, attempter_.error_event_->type);
   EXPECT_EQ(OmahaEvent::kResultError, attempter_.error_event_->result);
-  EXPECT_EQ(kCode | kActionCodeResumedFlag | kActionCodeTestOmahaUrlFlag,
+  EXPECT_EQ(kCode | kErrorCodeResumedFlag | kErrorCodeTestOmahaUrlFlag,
             attempter_.error_event_->error_code);
 }
 
diff --git a/utils.cc b/utils.cc
index 3eb0679..be98a71 100644
--- a/utils.cc
+++ b/utils.cc
@@ -764,21 +764,21 @@
   return "Unknown";
 }
 
-ActionExitCode GetBaseErrorCode(ActionExitCode code) {
+ErrorCode GetBaseErrorCode(ErrorCode code) {
   // Ignore the higher order bits in the code by applying the mask as
   // we want the enumerations to be in the small contiguous range
-  // with values less than kActionCodeUmaReportedMax.
-  ActionExitCode base_code = static_cast<ActionExitCode>(code & ~kSpecialFlags);
+  // with values less than kErrorCodeUmaReportedMax.
+  ErrorCode base_code = static_cast<ErrorCode>(code & ~kErrorCodeSpecialFlags);
 
   // Make additional adjustments required for UMA and error classification.
   // TODO(jaysri): Move this logic to UeErrorCode.cc when we fix
   // chromium-os:34369.
-  if (base_code >= kActionCodeOmahaRequestHTTPResponseBase) {
+  if (base_code >= kErrorCodeOmahaRequestHTTPResponseBase) {
     // Since we want to keep the enums to a small value, aggregate all HTTP
     // errors into this one bucket for UMA and error classification purposes.
     LOG(INFO) << "Converting error code " << base_code
-              << " to kActionCodeOmahaErrorInHTTPResponse";
-    base_code = kActionCodeOmahaErrorInHTTPResponse;
+              << " to kErrorCodeOmahaErrorInHTTPResponse";
+    base_code = kErrorCodeOmahaErrorInHTTPResponse;
   }
 
   return base_code;
@@ -788,13 +788,13 @@
 // bits of the given code. Returns an empty string if none of those bits are
 // set.
 string GetFlagNames(uint32_t code) {
-  uint32_t flags = code & kSpecialFlags;
+  uint32_t flags = code & kErrorCodeSpecialFlags;
   string flag_names;
   string separator = "";
   for(size_t i = 0; i < sizeof(flags) * 8; i++) {
     uint32_t flag = flags & (1 << i);
     if (flag) {
-      flag_names += separator + CodeToString(static_cast<ActionExitCode>(flag));
+      flag_names += separator + CodeToString(static_cast<ErrorCode>(flag));
       separator = ", ";
     }
   }
@@ -802,15 +802,15 @@
   return flag_names;
 }
 
-void SendErrorCodeToUma(SystemState* system_state, ActionExitCode code) {
+void SendErrorCodeToUma(SystemState* system_state, ErrorCode code) {
   if (!system_state)
     return;
 
-  ActionExitCode uma_error_code = GetBaseErrorCode(code);
+  ErrorCode uma_error_code = GetBaseErrorCode(code);
 
   // If the code doesn't have flags computed already, compute them now based on
   // the state of the current update attempt.
-  uint32_t flags = code & kSpecialFlags;
+  uint32_t flags = code & kErrorCodeSpecialFlags;
   if (!flags)
     flags = system_state->update_attempter()->GetErrorCodeFlags();
 
@@ -818,7 +818,7 @@
   // flag, as it's perfectly normal for production devices to resume their
   // downloads and so we want to record those cases also in NormalErrorCodes
   // bucket.
-  string metric = (flags & ~kActionCodeResumedFlag) ?
+  string metric = (flags & ~kErrorCodeResumedFlag) ?
       "Installer.DevModeErrorCodes" : "Installer.NormalErrorCodes";
 
   LOG(INFO) << "Sending error code " << uma_error_code
@@ -828,114 +828,114 @@
 
   system_state->metrics_lib()->SendEnumToUMA(metric,
                                              uma_error_code,
-                                             kActionCodeUmaReportedMax);
+                                             kErrorCodeUmaReportedMax);
 }
 
-string CodeToString(ActionExitCode code) {
+string CodeToString(ErrorCode code) {
   // If the given code has both parts (i.e. the error code part and the flags
   // part) then strip off the flags part since the switch statement below
   // has case statements only for the base error code or a single flag but
   // doesn't support any combinations of those.
-  if ((code & kSpecialFlags) && (code & ~kSpecialFlags))
-    code = static_cast<ActionExitCode>(code & ~kSpecialFlags);
+  if ((code & kErrorCodeSpecialFlags) && (code & ~kErrorCodeSpecialFlags))
+    code = static_cast<ErrorCode>(code & ~kErrorCodeSpecialFlags);
   switch (code) {
-    case kActionCodeSuccess: return "kActionCodeSuccess";
-    case kActionCodeError: return "kActionCodeError";
-    case kActionCodeOmahaRequestError: return "kActionCodeOmahaRequestError";
-    case kActionCodeOmahaResponseHandlerError:
-      return "kActionCodeOmahaResponseHandlerError";
-    case kActionCodeFilesystemCopierError:
-      return "kActionCodeFilesystemCopierError";
-    case kActionCodePostinstallRunnerError:
-      return "kActionCodePostinstallRunnerError";
-    case kActionCodeSetBootableFlagError:
-      return "kActionCodeSetBootableFlagError";
-    case kActionCodeInstallDeviceOpenError:
-      return "kActionCodeInstallDeviceOpenError";
-    case kActionCodeKernelDeviceOpenError:
-      return "kActionCodeKernelDeviceOpenError";
-    case kActionCodeDownloadTransferError:
-      return "kActionCodeDownloadTransferError";
-    case kActionCodePayloadHashMismatchError:
-      return "kActionCodePayloadHashMismatchError";
-    case kActionCodePayloadSizeMismatchError:
-      return "kActionCodePayloadSizeMismatchError";
-    case kActionCodeDownloadPayloadVerificationError:
-      return "kActionCodeDownloadPayloadVerificationError";
-    case kActionCodeDownloadNewPartitionInfoError:
-      return "kActionCodeDownloadNewPartitionInfoError";
-    case kActionCodeDownloadWriteError:
-      return "kActionCodeDownloadWriteError";
-    case kActionCodeNewRootfsVerificationError:
-      return "kActionCodeNewRootfsVerificationError";
-    case kActionCodeNewKernelVerificationError:
-      return "kActionCodeNewKernelVerificationError";
-    case kActionCodeSignedDeltaPayloadExpectedError:
-      return "kActionCodeSignedDeltaPayloadExpectedError";
-    case kActionCodeDownloadPayloadPubKeyVerificationError:
-      return "kActionCodeDownloadPayloadPubKeyVerificationError";
-    case kActionCodePostinstallBootedFromFirmwareB:
-      return "kActionCodePostinstallBootedFromFirmwareB";
-    case kActionCodeDownloadStateInitializationError:
-      return "kActionCodeDownloadStateInitializationError";
-    case kActionCodeDownloadInvalidMetadataMagicString:
-      return "kActionCodeDownloadInvalidMetadataMagicString";
-    case kActionCodeDownloadSignatureMissingInManifest:
-      return "kActionCodeDownloadSignatureMissingInManifest";
-    case kActionCodeDownloadManifestParseError:
-      return "kActionCodeDownloadManifestParseError";
-    case kActionCodeDownloadMetadataSignatureError:
-      return "kActionCodeDownloadMetadataSignatureError";
-    case kActionCodeDownloadMetadataSignatureVerificationError:
-      return "kActionCodeDownloadMetadataSignatureVerificationError";
-    case kActionCodeDownloadMetadataSignatureMismatch:
-      return "kActionCodeDownloadMetadataSignatureMismatch";
-    case kActionCodeDownloadOperationHashVerificationError:
-      return "kActionCodeDownloadOperationHashVerificationError";
-    case kActionCodeDownloadOperationExecutionError:
-      return "kActionCodeDownloadOperationExecutionError";
-    case kActionCodeDownloadOperationHashMismatch:
-      return "kActionCodeDownloadOperationHashMismatch";
-    case kActionCodeOmahaRequestEmptyResponseError:
-      return "kActionCodeOmahaRequestEmptyResponseError";
-    case kActionCodeOmahaRequestXMLParseError:
-      return "kActionCodeOmahaRequestXMLParseError";
-    case kActionCodeDownloadInvalidMetadataSize:
-      return "kActionCodeDownloadInvalidMetadataSize";
-    case kActionCodeDownloadInvalidMetadataSignature:
-      return "kActionCodeDownloadInvalidMetadataSignature";
-    case kActionCodeOmahaResponseInvalid:
-      return "kActionCodeOmahaResponseInvalid";
-    case kActionCodeOmahaUpdateIgnoredPerPolicy:
-      return "kActionCodeOmahaUpdateIgnoredPerPolicy";
-    case kActionCodeOmahaUpdateDeferredPerPolicy:
-      return "kActionCodeOmahaUpdateDeferredPerPolicy";
-    case kActionCodeOmahaErrorInHTTPResponse:
-      return "kActionCodeOmahaErrorInHTTPResponse";
-    case kActionCodeDownloadOperationHashMissingError:
-      return "kActionCodeDownloadOperationHashMissingError";
-    case kActionCodeDownloadMetadataSignatureMissingError:
-      return "kActionCodeDownloadMetadataSignatureMissingError";
-    case kActionCodeOmahaUpdateDeferredForBackoff:
-      return "kActionCodeOmahaUpdateDeferredForBackoff";
-    case kActionCodePostinstallPowerwashError:
-      return "kActionCodePostinstallPowerwashError";
-    case kActionCodeUpdateCanceledByChannelChange:
-      return "kActionCodeUpdateCanceledByChannelChange";
-    case kActionCodeUmaReportedMax:
-      return "kActionCodeUmaReportedMax";
-    case kActionCodeOmahaRequestHTTPResponseBase:
-      return "kActionCodeOmahaRequestHTTPResponseBase";
-    case kActionCodeResumedFlag:
+    case kErrorCodeSuccess: return "kErrorCodeSuccess";
+    case kErrorCodeError: return "kErrorCodeError";
+    case kErrorCodeOmahaRequestError: return "kErrorCodeOmahaRequestError";
+    case kErrorCodeOmahaResponseHandlerError:
+      return "kErrorCodeOmahaResponseHandlerError";
+    case kErrorCodeFilesystemCopierError:
+      return "kErrorCodeFilesystemCopierError";
+    case kErrorCodePostinstallRunnerError:
+      return "kErrorCodePostinstallRunnerError";
+    case kErrorCodeSetBootableFlagError:
+      return "kErrorCodeSetBootableFlagError";
+    case kErrorCodeInstallDeviceOpenError:
+      return "kErrorCodeInstallDeviceOpenError";
+    case kErrorCodeKernelDeviceOpenError:
+      return "kErrorCodeKernelDeviceOpenError";
+    case kErrorCodeDownloadTransferError:
+      return "kErrorCodeDownloadTransferError";
+    case kErrorCodePayloadHashMismatchError:
+      return "kErrorCodePayloadHashMismatchError";
+    case kErrorCodePayloadSizeMismatchError:
+      return "kErrorCodePayloadSizeMismatchError";
+    case kErrorCodeDownloadPayloadVerificationError:
+      return "kErrorCodeDownloadPayloadVerificationError";
+    case kErrorCodeDownloadNewPartitionInfoError:
+      return "kErrorCodeDownloadNewPartitionInfoError";
+    case kErrorCodeDownloadWriteError:
+      return "kErrorCodeDownloadWriteError";
+    case kErrorCodeNewRootfsVerificationError:
+      return "kErrorCodeNewRootfsVerificationError";
+    case kErrorCodeNewKernelVerificationError:
+      return "kErrorCodeNewKernelVerificationError";
+    case kErrorCodeSignedDeltaPayloadExpectedError:
+      return "kErrorCodeSignedDeltaPayloadExpectedError";
+    case kErrorCodeDownloadPayloadPubKeyVerificationError:
+      return "kErrorCodeDownloadPayloadPubKeyVerificationError";
+    case kErrorCodePostinstallBootedFromFirmwareB:
+      return "kErrorCodePostinstallBootedFromFirmwareB";
+    case kErrorCodeDownloadStateInitializationError:
+      return "kErrorCodeDownloadStateInitializationError";
+    case kErrorCodeDownloadInvalidMetadataMagicString:
+      return "kErrorCodeDownloadInvalidMetadataMagicString";
+    case kErrorCodeDownloadSignatureMissingInManifest:
+      return "kErrorCodeDownloadSignatureMissingInManifest";
+    case kErrorCodeDownloadManifestParseError:
+      return "kErrorCodeDownloadManifestParseError";
+    case kErrorCodeDownloadMetadataSignatureError:
+      return "kErrorCodeDownloadMetadataSignatureError";
+    case kErrorCodeDownloadMetadataSignatureVerificationError:
+      return "kErrorCodeDownloadMetadataSignatureVerificationError";
+    case kErrorCodeDownloadMetadataSignatureMismatch:
+      return "kErrorCodeDownloadMetadataSignatureMismatch";
+    case kErrorCodeDownloadOperationHashVerificationError:
+      return "kErrorCodeDownloadOperationHashVerificationError";
+    case kErrorCodeDownloadOperationExecutionError:
+      return "kErrorCodeDownloadOperationExecutionError";
+    case kErrorCodeDownloadOperationHashMismatch:
+      return "kErrorCodeDownloadOperationHashMismatch";
+    case kErrorCodeOmahaRequestEmptyResponseError:
+      return "kErrorCodeOmahaRequestEmptyResponseError";
+    case kErrorCodeOmahaRequestXMLParseError:
+      return "kErrorCodeOmahaRequestXMLParseError";
+    case kErrorCodeDownloadInvalidMetadataSize:
+      return "kErrorCodeDownloadInvalidMetadataSize";
+    case kErrorCodeDownloadInvalidMetadataSignature:
+      return "kErrorCodeDownloadInvalidMetadataSignature";
+    case kErrorCodeOmahaResponseInvalid:
+      return "kErrorCodeOmahaResponseInvalid";
+    case kErrorCodeOmahaUpdateIgnoredPerPolicy:
+      return "kErrorCodeOmahaUpdateIgnoredPerPolicy";
+    case kErrorCodeOmahaUpdateDeferredPerPolicy:
+      return "kErrorCodeOmahaUpdateDeferredPerPolicy";
+    case kErrorCodeOmahaErrorInHTTPResponse:
+      return "kErrorCodeOmahaErrorInHTTPResponse";
+    case kErrorCodeDownloadOperationHashMissingError:
+      return "kErrorCodeDownloadOperationHashMissingError";
+    case kErrorCodeDownloadMetadataSignatureMissingError:
+      return "kErrorCodeDownloadMetadataSignatureMissingError";
+    case kErrorCodeOmahaUpdateDeferredForBackoff:
+      return "kErrorCodeOmahaUpdateDeferredForBackoff";
+    case kErrorCodePostinstallPowerwashError:
+      return "kErrorCodePostinstallPowerwashError";
+    case kErrorCodeUpdateCanceledByChannelChange:
+      return "kErrorCodeUpdateCanceledByChannelChange";
+    case kErrorCodeUmaReportedMax:
+      return "kErrorCodeUmaReportedMax";
+    case kErrorCodeOmahaRequestHTTPResponseBase:
+      return "kErrorCodeOmahaRequestHTTPResponseBase";
+    case kErrorCodeResumedFlag:
       return "Resumed";
-    case kActionCodeDevModeFlag:
+    case kErrorCodeDevModeFlag:
       return "DevMode";
-    case kActionCodeTestImageFlag:
+    case kErrorCodeTestImageFlag:
       return "TestImage";
-    case kActionCodeTestOmahaUrlFlag:
+    case kErrorCodeTestOmahaUrlFlag:
       return "TestOmahaUrl";
-    case kSpecialFlags:
-      return "kSpecialFlags";
+    case kErrorCodeSpecialFlags:
+      return "kErrorCodeSpecialFlags";
     // Don't add a default case to let the compiler warn about newly added
     // error codes which should be added here.
   }
diff --git a/utils.h b/utils.h
index 74c4d16..bc645d2 100644
--- a/utils.h
+++ b/utils.h
@@ -294,16 +294,16 @@
 // aggregating error codes beyond the enum range, etc. This method is
 // idempotent, i.e. if called with a value previously returned by this method,
 // it'll return the same value again.
-ActionExitCode GetBaseErrorCode(ActionExitCode code);
+ErrorCode GetBaseErrorCode(ErrorCode code);
 
 // Sends the error code to UMA using the metrics interface object in the given
 // system state. It also uses the system state to determine the right UMA
 // bucket for the error code.
-void SendErrorCodeToUma(SystemState* system_state, ActionExitCode code);
+void SendErrorCodeToUma(SystemState* system_state, ErrorCode code);
 
-// Returns a string representation of the ActionExitCodes (either the base
+// Returns a string representation of the ErrorCodes (either the base
 // error codes or the bit flags) for logging purposes.
-std::string CodeToString(ActionExitCode code);
+std::string CodeToString(ErrorCode code);
 
 // Creates the powerwash marker file with the appropriate commands in it.
 // Returns true if successfully created. False otherwise.
@@ -441,13 +441,13 @@
                                  AbstractAction* action)
       : processor_(processor),
         action_(action),
-        code_(kActionCodeError),
+        code_(kErrorCodeError),
         should_complete_(true) {}
   ~ScopedActionCompleter() {
     if (should_complete_)
       processor_->ActionComplete(action_, code_);
   }
-  void set_code(ActionExitCode code) { code_ = code; }
+  void set_code(ErrorCode code) { code_ = code; }
   void set_should_complete(bool should_complete) {
     should_complete_ = should_complete;
   }
@@ -455,7 +455,7 @@
  private:
   ActionProcessor* processor_;
   AbstractAction* action_;
-  ActionExitCode code_;
+  ErrorCode code_;
   bool should_complete_;
   DISALLOW_COPY_AND_ASSIGN(ScopedActionCompleter);
 };