diff --git a/scripts/update_payload/checker_unittest.py b/scripts/update_payload/checker_unittest.py
index a22373f..b761873 100755
--- a/scripts/update_payload/checker_unittest.py
+++ b/scripts/update_payload/checker_unittest.py
@@ -35,6 +35,9 @@
       'BSDIFF': common.OpType.BSDIFF,
       'SOURCE_COPY': common.OpType.SOURCE_COPY,
       'SOURCE_BSDIFF': common.OpType.SOURCE_BSDIFF,
+      'ZERO': common.OpType.ZERO,
+      'DISCARD': common.OpType.DISCARD,
+      'REPLACE_XZ': common.OpType.REPLACE_XZ,
   }
   return op_name_to_type[op_name]
 
@@ -157,7 +160,7 @@
     subreport = 'fake subreport'
 
     # Create a mock message.
-    msg = self.mox.CreateMock(update_metadata_pb2.message.Message)
+    msg = self.mox.CreateMock(update_metadata_pb2._message.Message)
     msg.HasField(name).AndReturn(is_present)
     setattr(msg, name, val)
 
@@ -560,7 +563,7 @@
     data_length = 10000
 
     op = self.mox.CreateMock(
-        update_metadata_pb2.DeltaArchiveManifest.InstallOperation)
+        update_metadata_pb2.InstallOperation)
     op.type = common.OpType.REPLACE
 
     # Pass.
@@ -598,7 +601,7 @@
     data_length = block_size * 3
 
     op = self.mox.CreateMock(
-        update_metadata_pb2.DeltaArchiveManifest.InstallOperation)
+        update_metadata_pb2.InstallOperation)
     op.type = common.OpType.REPLACE_BZ
 
     # Pass.
@@ -632,7 +635,7 @@
   def testCheckMoveOperation_Pass(self):
     """Tests _CheckMoveOperation(); pass case."""
     payload_checker = checker.PayloadChecker(self.MockPayload())
-    op = update_metadata_pb2.DeltaArchiveManifest.InstallOperation()
+    op = update_metadata_pb2.InstallOperation()
     op.type = common.OpType.MOVE
 
     self.AddToMessage(op.src_extents,
@@ -645,7 +648,7 @@
   def testCheckMoveOperation_FailContainsData(self):
     """Tests _CheckMoveOperation(); fails, message contains data."""
     payload_checker = checker.PayloadChecker(self.MockPayload())
-    op = update_metadata_pb2.DeltaArchiveManifest.InstallOperation()
+    op = update_metadata_pb2.InstallOperation()
     op.type = common.OpType.MOVE
 
     self.AddToMessage(op.src_extents,
@@ -660,7 +663,7 @@
   def testCheckMoveOperation_FailInsufficientSrcBlocks(self):
     """Tests _CheckMoveOperation(); fails, not enough actual src blocks."""
     payload_checker = checker.PayloadChecker(self.MockPayload())
-    op = update_metadata_pb2.DeltaArchiveManifest.InstallOperation()
+    op = update_metadata_pb2.InstallOperation()
     op.type = common.OpType.MOVE
 
     self.AddToMessage(op.src_extents,
@@ -675,7 +678,7 @@
   def testCheckMoveOperation_FailInsufficientDstBlocks(self):
     """Tests _CheckMoveOperation(); fails, not enough actual dst blocks."""
     payload_checker = checker.PayloadChecker(self.MockPayload())
-    op = update_metadata_pb2.DeltaArchiveManifest.InstallOperation()
+    op = update_metadata_pb2.InstallOperation()
     op.type = common.OpType.MOVE
 
     self.AddToMessage(op.src_extents,
@@ -690,7 +693,7 @@
   def testCheckMoveOperation_FailExcessSrcBlocks(self):
     """Tests _CheckMoveOperation(); fails, too many actual src blocks."""
     payload_checker = checker.PayloadChecker(self.MockPayload())
-    op = update_metadata_pb2.DeltaArchiveManifest.InstallOperation()
+    op = update_metadata_pb2.InstallOperation()
     op.type = common.OpType.MOVE
 
     self.AddToMessage(op.src_extents,
@@ -713,7 +716,7 @@
   def testCheckMoveOperation_FailExcessDstBlocks(self):
     """Tests _CheckMoveOperation(); fails, too many actual dst blocks."""
     payload_checker = checker.PayloadChecker(self.MockPayload())
-    op = update_metadata_pb2.DeltaArchiveManifest.InstallOperation()
+    op = update_metadata_pb2.InstallOperation()
     op.type = common.OpType.MOVE
 
     self.AddToMessage(op.src_extents,
@@ -728,7 +731,7 @@
   def testCheckMoveOperation_FailStagnantBlocks(self):
     """Tests _CheckMoveOperation(); fails, there are blocks that do not move."""
     payload_checker = checker.PayloadChecker(self.MockPayload())
-    op = update_metadata_pb2.DeltaArchiveManifest.InstallOperation()
+    op = update_metadata_pb2.InstallOperation()
     op.type = common.OpType.MOVE
 
     self.AddToMessage(op.src_extents,
@@ -743,7 +746,7 @@
   def testCheckMoveOperation_FailZeroStartBlock(self):
     """Tests _CheckMoveOperation(); fails, has extent with start block 0."""
     payload_checker = checker.PayloadChecker(self.MockPayload())
-    op = update_metadata_pb2.DeltaArchiveManifest.InstallOperation()
+    op = update_metadata_pb2.InstallOperation()
     op.type = common.OpType.MOVE
 
     self.AddToMessage(op.src_extents,
@@ -848,7 +851,7 @@
     blob_hash_counts = collections.defaultdict(int)
 
     # Create the operation object for the test.
-    op = update_metadata_pb2.DeltaArchiveManifest.InstallOperation()
+    op = update_metadata_pb2.InstallOperation()
     op.type = op_type
 
     total_src_blocks = 0
diff --git a/scripts/update_payload/common.py b/scripts/update_payload/common.py
index 1a9b010..9d008a9 100644
--- a/scripts/update_payload/common.py
+++ b/scripts/update_payload/common.py
@@ -29,7 +29,7 @@
 #
 class OpType(object):
   """Container for operation type constants."""
-  _CLASS = update_metadata_pb2.DeltaArchiveManifest.InstallOperation
+  _CLASS = update_metadata_pb2.InstallOperation
   # pylint: disable=E1101
   REPLACE = _CLASS.REPLACE
   REPLACE_BZ = _CLASS.REPLACE_BZ
@@ -37,14 +37,21 @@
   BSDIFF = _CLASS.BSDIFF
   SOURCE_COPY = _CLASS.SOURCE_COPY
   SOURCE_BSDIFF = _CLASS.SOURCE_BSDIFF
-  ALL = (REPLACE, REPLACE_BZ, MOVE, BSDIFF, SOURCE_COPY, SOURCE_BSDIFF)
+  ZERO = _CLASS.ZERO
+  DISCARD = _CLASS.DISCARD
+  REPLACE_XZ = _CLASS.REPLACE_XZ
+  ALL = (REPLACE, REPLACE_BZ, MOVE, BSDIFF, SOURCE_COPY, SOURCE_BSDIFF, ZERO,
+         DISCARD, REPLACE_XZ)
   NAMES = {
       REPLACE: 'REPLACE',
       REPLACE_BZ: 'REPLACE_BZ',
       MOVE: 'MOVE',
       BSDIFF: 'BSDIFF',
       SOURCE_COPY: 'SOURCE_COPY',
-      SOURCE_BSDIFF: 'SOURCE_BSDIFF'
+      SOURCE_BSDIFF: 'SOURCE_BSDIFF',
+      ZERO: 'ZERO',
+      DISCARD: 'DISCARD',
+      REPLACE_XZ: 'REPLACE_XZ'
   }
 
   def __init__(self):
diff --git a/scripts/update_payload/test_utils.py b/scripts/update_payload/test_utils.py
index 4e7881d..8746fce 100644
--- a/scripts/update_payload/test_utils.py
+++ b/scripts/update_payload/test_utils.py
@@ -8,6 +8,7 @@
 
 import cStringIO
 import hashlib
+import os
 import struct
 import subprocess
 
@@ -21,8 +22,10 @@
 
 
 # Private/public RSA keys used for testing.
-_PRIVKEY_FILE_NAME = 'payload-test-key.pem'
-_PUBKEY_FILE_NAME = 'payload-test-key.pub'
+_PRIVKEY_FILE_NAME = os.path.join(os.path.dirname(__file__),
+                                  'payload-test-key.pem')
+_PUBKEY_FILE_NAME = os.path.join(os.path.dirname(__file__),
+                                 'payload-test-key.pub')
 
 
 def KiB(count):
diff --git a/scripts/update_payload/update_metadata_pb2.py b/scripts/update_payload/update_metadata_pb2.py
index 895e465..383ec6f 100644
--- a/scripts/update_payload/update_metadata_pb2.py
+++ b/scripts/update_payload/update_metadata_pb2.py
@@ -1,72 +1,95 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: update_metadata.proto
 
-from google.protobuf import descriptor
-from google.protobuf import message
-from google.protobuf import reflection
+import sys
+_b=sys.version_info[0]<3 and (lambda x:x) or (lambda x:x.encode('latin1'))
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
+from google.protobuf import symbol_database as _symbol_database
 from google.protobuf import descriptor_pb2
 # @@protoc_insertion_point(imports)
 
+_sym_db = _symbol_database.Default()
 
-DESCRIPTOR = descriptor.FileDescriptor(
+
+
+
+DESCRIPTOR = _descriptor.FileDescriptor(
   name='update_metadata.proto',
   package='chromeos_update_engine',
-  serialized_pb='\n\x15update_metadata.proto\x12\x16\x63hromeos_update_engine\"1\n\x06\x45xtent\x12\x13\n\x0bstart_block\x18\x01 \x01(\x04\x12\x12\n\nnum_blocks\x18\x02 \x01(\x04\"z\n\nSignatures\x12@\n\nsignatures\x18\x01 \x03(\x0b\x32,.chromeos_update_engine.Signatures.Signature\x1a*\n\tSignature\x12\x0f\n\x07version\x18\x01 \x01(\r\x12\x0c\n\x04\x64\x61ta\x18\x02 \x01(\x0c\"+\n\rPartitionInfo\x12\x0c\n\x04size\x18\x01 \x01(\x04\x12\x0c\n\x04hash\x18\x02 \x01(\x0c\"w\n\tImageInfo\x12\r\n\x05\x62oard\x18\x01 \x01(\t\x12\x0b\n\x03key\x18\x02 \x01(\t\x12\x0f\n\x07\x63hannel\x18\x03 \x01(\t\x12\x0f\n\x07version\x18\x04 \x01(\t\x12\x15\n\rbuild_channel\x18\x05 \x01(\t\x12\x15\n\rbuild_version\x18\x06 \x01(\t\"\xcd\x08\n\x14\x44\x65ltaArchiveManifest\x12Y\n\x12install_operations\x18\x01 \x03(\x0b\x32=.chromeos_update_engine.DeltaArchiveManifest.InstallOperation\x12`\n\x19kernel_install_operations\x18\x02 \x03(\x0b\x32=.chromeos_update_engine.DeltaArchiveManifest.InstallOperation\x12\x18\n\nblock_size\x18\x03 \x01(\r:\x04\x34\x30\x39\x36\x12\x19\n\x11signatures_offset\x18\x04 \x01(\x04\x12\x17\n\x0fsignatures_size\x18\x05 \x01(\x04\x12>\n\x0fold_kernel_info\x18\x06 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12>\n\x0fnew_kernel_info\x18\x07 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12>\n\x0fold_rootfs_info\x18\x08 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12>\n\x0fnew_rootfs_info\x18\t \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12\x39\n\x0eold_image_info\x18\n \x01(\x0b\x32!.chromeos_update_engine.ImageInfo\x12\x39\n\x0enew_image_info\x18\x0b \x01(\x0b\x32!.chromeos_update_engine.ImageInfo\x12\x18\n\rminor_version\x18\x0c \x01(\r:\x01\x30\x1a\x99\x03\n\x10InstallOperation\x12P\n\x04type\x18\x01 \x02(\x0e\x32\x42.chromeos_update_engine.DeltaArchiveManifest.InstallOperation.Type\x12\x13\n\x0b\x64\x61ta_offset\x18\x02 \x01(\r\x12\x13\n\x0b\x64\x61ta_length\x18\x03 \x01(\r\x12\x33\n\x0bsrc_extents\x18\x04 \x03(\x0b\x32\x1e.chromeos_update_engine.Extent\x12\x12\n\nsrc_length\x18\x05 \x01(\x04\x12\x33\n\x0b\x64st_extents\x18\x06 \x03(\x0b\x32\x1e.chromeos_update_engine.Extent\x12\x12\n\ndst_length\x18\x07 \x01(\x04\x12\x18\n\x10\x64\x61ta_sha256_hash\x18\x08 \x01(\x0c\"]\n\x04Type\x12\x0b\n\x07REPLACE\x10\x00\x12\x0e\n\nREPLACE_BZ\x10\x01\x12\x08\n\x04MOVE\x10\x02\x12\n\n\x06\x42SDIFF\x10\x03\x12\x0f\n\x0bSOURCE_COPY\x10\x04\x12\x11\n\rSOURCE_BSDIFF\x10\x05\x42\x02H\x03')
+  serialized_pb=_b('\n\x15update_metadata.proto\x12\x16\x63hromeos_update_engine\"1\n\x06\x45xtent\x12\x13\n\x0bstart_block\x18\x01 \x01(\x04\x12\x12\n\nnum_blocks\x18\x02 \x01(\x04\"z\n\nSignatures\x12@\n\nsignatures\x18\x01 \x03(\x0b\x32,.chromeos_update_engine.Signatures.Signature\x1a*\n\tSignature\x12\x0f\n\x07version\x18\x01 \x01(\r\x12\x0c\n\x04\x64\x61ta\x18\x02 \x01(\x0c\"+\n\rPartitionInfo\x12\x0c\n\x04size\x18\x01 \x01(\x04\x12\x0c\n\x04hash\x18\x02 \x01(\x0c\"w\n\tImageInfo\x12\r\n\x05\x62oard\x18\x01 \x01(\t\x12\x0b\n\x03key\x18\x02 \x01(\t\x12\x0f\n\x07\x63hannel\x18\x03 \x01(\t\x12\x0f\n\x07version\x18\x04 \x01(\t\x12\x15\n\rbuild_channel\x18\x05 \x01(\t\x12\x15\n\rbuild_version\x18\x06 \x01(\t\"\xc5\x03\n\x10InstallOperation\x12;\n\x04type\x18\x01 \x02(\x0e\x32-.chromeos_update_engine.InstallOperation.Type\x12\x13\n\x0b\x64\x61ta_offset\x18\x02 \x01(\r\x12\x13\n\x0b\x64\x61ta_length\x18\x03 \x01(\r\x12\x33\n\x0bsrc_extents\x18\x04 \x03(\x0b\x32\x1e.chromeos_update_engine.Extent\x12\x12\n\nsrc_length\x18\x05 \x01(\x04\x12\x33\n\x0b\x64st_extents\x18\x06 \x03(\x0b\x32\x1e.chromeos_update_engine.Extent\x12\x12\n\ndst_length\x18\x07 \x01(\x04\x12\x18\n\x10\x64\x61ta_sha256_hash\x18\x08 \x01(\x0c\x12\x17\n\x0fsrc_sha256_hash\x18\t \x01(\x0c\"\x84\x01\n\x04Type\x12\x0b\n\x07REPLACE\x10\x00\x12\x0e\n\nREPLACE_BZ\x10\x01\x12\x08\n\x04MOVE\x10\x02\x12\n\n\x06\x42SDIFF\x10\x03\x12\x0f\n\x0bSOURCE_COPY\x10\x04\x12\x11\n\rSOURCE_BSDIFF\x10\x05\x12\x08\n\x04ZERO\x10\x06\x12\x0b\n\x07\x44ISCARD\x10\x07\x12\x0e\n\nREPLACE_XZ\x10\x08\"\xd5\x02\n\x0fPartitionUpdate\x12\x16\n\x0epartition_name\x18\x01 \x02(\t\x12\x17\n\x0frun_postinstall\x18\x02 \x01(\x08\x12M\n\x17new_partition_signature\x18\x03 \x03(\x0b\x32,.chromeos_update_engine.Signatures.Signature\x12\x41\n\x12old_partition_info\x18\x04 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12\x41\n\x12new_partition_info\x18\x05 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12<\n\noperations\x18\x06 \x03(\x0b\x32(.chromeos_update_engine.InstallOperation\"\xc4\x05\n\x14\x44\x65ltaArchiveManifest\x12\x44\n\x12install_operations\x18\x01 \x03(\x0b\x32(.chromeos_update_engine.InstallOperation\x12K\n\x19kernel_install_operations\x18\x02 \x03(\x0b\x32(.chromeos_update_engine.InstallOperation\x12\x18\n\nblock_size\x18\x03 \x01(\r:\x04\x34\x30\x39\x36\x12\x19\n\x11signatures_offset\x18\x04 \x01(\x04\x12\x17\n\x0fsignatures_size\x18\x05 \x01(\x04\x12>\n\x0fold_kernel_info\x18\x06 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12>\n\x0fnew_kernel_info\x18\x07 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12>\n\x0fold_rootfs_info\x18\x08 \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12>\n\x0fnew_rootfs_info\x18\t \x01(\x0b\x32%.chromeos_update_engine.PartitionInfo\x12\x39\n\x0eold_image_info\x18\n \x01(\x0b\x32!.chromeos_update_engine.ImageInfo\x12\x39\n\x0enew_image_info\x18\x0b \x01(\x0b\x32!.chromeos_update_engine.ImageInfo\x12\x18\n\rminor_version\x18\x0c \x01(\r:\x01\x30\x12;\n\npartitions\x18\r \x03(\x0b\x32\'.chromeos_update_engine.PartitionUpdateB\x02H\x03')
+)
+_sym_db.RegisterFileDescriptor(DESCRIPTOR)
 
 
 
-_DELTAARCHIVEMANIFEST_INSTALLOPERATION_TYPE = descriptor.EnumDescriptor(
+_INSTALLOPERATION_TYPE = _descriptor.EnumDescriptor(
   name='Type',
-  full_name='chromeos_update_engine.DeltaArchiveManifest.InstallOperation.Type',
+  full_name='chromeos_update_engine.InstallOperation.Type',
   filename=None,
   file=DESCRIPTOR,
   values=[
-    descriptor.EnumValueDescriptor(
+    _descriptor.EnumValueDescriptor(
       name='REPLACE', index=0, number=0,
       options=None,
       type=None),
-    descriptor.EnumValueDescriptor(
+    _descriptor.EnumValueDescriptor(
       name='REPLACE_BZ', index=1, number=1,
       options=None,
       type=None),
-    descriptor.EnumValueDescriptor(
+    _descriptor.EnumValueDescriptor(
       name='MOVE', index=2, number=2,
       options=None,
       type=None),
-    descriptor.EnumValueDescriptor(
+    _descriptor.EnumValueDescriptor(
       name='BSDIFF', index=3, number=3,
       options=None,
       type=None),
-    descriptor.EnumValueDescriptor(
+    _descriptor.EnumValueDescriptor(
       name='SOURCE_COPY', index=4, number=4,
       options=None,
       type=None),
-    descriptor.EnumValueDescriptor(
+    _descriptor.EnumValueDescriptor(
       name='SOURCE_BSDIFF', index=5, number=5,
       options=None,
       type=None),
+    _descriptor.EnumValueDescriptor(
+      name='ZERO', index=6, number=6,
+      options=None,
+      type=None),
+    _descriptor.EnumValueDescriptor(
+      name='DISCARD', index=7, number=7,
+      options=None,
+      type=None),
+    _descriptor.EnumValueDescriptor(
+      name='REPLACE_XZ', index=8, number=8,
+      options=None,
+      type=None),
   ],
   containing_type=None,
   options=None,
-  serialized_start=1399,
-  serialized_end=1492,
+  serialized_start=712,
+  serialized_end=844,
 )
+_sym_db.RegisterEnumDescriptor(_INSTALLOPERATION_TYPE)
 
 
-_EXTENT = descriptor.Descriptor(
+_EXTENT = _descriptor.Descriptor(
   name='Extent',
   full_name='chromeos_update_engine.Extent',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='start_block', full_name='chromeos_update_engine.Extent.start_block', index=0,
       number=1, type=4, cpp_type=4, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='num_blocks', full_name='chromeos_update_engine.Extent.num_blocks', index=1,
       number=2, type=4, cpp_type=4, label=1,
       has_default_value=False, default_value=0,
@@ -82,29 +105,31 @@
   options=None,
   is_extendable=False,
   extension_ranges=[],
+  oneofs=[
+  ],
   serialized_start=49,
   serialized_end=98,
 )
 
 
-_SIGNATURES_SIGNATURE = descriptor.Descriptor(
+_SIGNATURES_SIGNATURE = _descriptor.Descriptor(
   name='Signature',
   full_name='chromeos_update_engine.Signatures.Signature',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='version', full_name='chromeos_update_engine.Signatures.Signature.version', index=0,
       number=1, type=13, cpp_type=3, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='data', full_name='chromeos_update_engine.Signatures.Signature.data', index=1,
       number=2, type=12, cpp_type=9, label=1,
-      has_default_value=False, default_value="",
+      has_default_value=False, default_value=_b(""),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
@@ -117,18 +142,20 @@
   options=None,
   is_extendable=False,
   extension_ranges=[],
+  oneofs=[
+  ],
   serialized_start=180,
   serialized_end=222,
 )
 
-_SIGNATURES = descriptor.Descriptor(
+_SIGNATURES = _descriptor.Descriptor(
   name='Signatures',
   full_name='chromeos_update_engine.Signatures',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='signatures', full_name='chromeos_update_engine.Signatures.signatures', index=0,
       number=1, type=11, cpp_type=10, label=3,
       has_default_value=False, default_value=[],
@@ -144,29 +171,31 @@
   options=None,
   is_extendable=False,
   extension_ranges=[],
+  oneofs=[
+  ],
   serialized_start=100,
   serialized_end=222,
 )
 
 
-_PARTITIONINFO = descriptor.Descriptor(
+_PARTITIONINFO = _descriptor.Descriptor(
   name='PartitionInfo',
   full_name='chromeos_update_engine.PartitionInfo',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='size', full_name='chromeos_update_engine.PartitionInfo.size', index=0,
       number=1, type=4, cpp_type=4, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='hash', full_name='chromeos_update_engine.PartitionInfo.hash', index=1,
       number=2, type=12, cpp_type=9, label=1,
-      has_default_value=False, default_value="",
+      has_default_value=False, default_value=_b(""),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
@@ -179,57 +208,59 @@
   options=None,
   is_extendable=False,
   extension_ranges=[],
+  oneofs=[
+  ],
   serialized_start=224,
   serialized_end=267,
 )
 
 
-_IMAGEINFO = descriptor.Descriptor(
+_IMAGEINFO = _descriptor.Descriptor(
   name='ImageInfo',
   full_name='chromeos_update_engine.ImageInfo',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='board', full_name='chromeos_update_engine.ImageInfo.board', index=0,
       number=1, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=unicode("", "utf-8"),
+      has_default_value=False, default_value=_b("").decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='key', full_name='chromeos_update_engine.ImageInfo.key', index=1,
       number=2, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=unicode("", "utf-8"),
+      has_default_value=False, default_value=_b("").decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='channel', full_name='chromeos_update_engine.ImageInfo.channel', index=2,
       number=3, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=unicode("", "utf-8"),
+      has_default_value=False, default_value=_b("").decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='version', full_name='chromeos_update_engine.ImageInfo.version', index=3,
       number=4, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=unicode("", "utf-8"),
+      has_default_value=False, default_value=_b("").decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='build_channel', full_name='chromeos_update_engine.ImageInfo.build_channel', index=4,
       number=5, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=unicode("", "utf-8"),
+      has_default_value=False, default_value=_b("").decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='build_version', full_name='chromeos_update_engine.ImageInfo.build_version', index=5,
       number=6, type=9, cpp_type=9, label=1,
-      has_default_value=False, default_value=unicode("", "utf-8"),
+      has_default_value=False, default_value=_b("").decode('utf-8'),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
@@ -242,71 +273,80 @@
   options=None,
   is_extendable=False,
   extension_ranges=[],
+  oneofs=[
+  ],
   serialized_start=269,
   serialized_end=388,
 )
 
 
-_DELTAARCHIVEMANIFEST_INSTALLOPERATION = descriptor.Descriptor(
+_INSTALLOPERATION = _descriptor.Descriptor(
   name='InstallOperation',
-  full_name='chromeos_update_engine.DeltaArchiveManifest.InstallOperation',
+  full_name='chromeos_update_engine.InstallOperation',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
-    descriptor.FieldDescriptor(
-      name='type', full_name='chromeos_update_engine.DeltaArchiveManifest.InstallOperation.type', index=0,
+    _descriptor.FieldDescriptor(
+      name='type', full_name='chromeos_update_engine.InstallOperation.type', index=0,
       number=1, type=14, cpp_type=8, label=2,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
-      name='data_offset', full_name='chromeos_update_engine.DeltaArchiveManifest.InstallOperation.data_offset', index=1,
+    _descriptor.FieldDescriptor(
+      name='data_offset', full_name='chromeos_update_engine.InstallOperation.data_offset', index=1,
       number=2, type=13, cpp_type=3, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
-      name='data_length', full_name='chromeos_update_engine.DeltaArchiveManifest.InstallOperation.data_length', index=2,
+    _descriptor.FieldDescriptor(
+      name='data_length', full_name='chromeos_update_engine.InstallOperation.data_length', index=2,
       number=3, type=13, cpp_type=3, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
-      name='src_extents', full_name='chromeos_update_engine.DeltaArchiveManifest.InstallOperation.src_extents', index=3,
+    _descriptor.FieldDescriptor(
+      name='src_extents', full_name='chromeos_update_engine.InstallOperation.src_extents', index=3,
       number=4, type=11, cpp_type=10, label=3,
       has_default_value=False, default_value=[],
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
-      name='src_length', full_name='chromeos_update_engine.DeltaArchiveManifest.InstallOperation.src_length', index=4,
+    _descriptor.FieldDescriptor(
+      name='src_length', full_name='chromeos_update_engine.InstallOperation.src_length', index=4,
       number=5, type=4, cpp_type=4, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
-      name='dst_extents', full_name='chromeos_update_engine.DeltaArchiveManifest.InstallOperation.dst_extents', index=5,
+    _descriptor.FieldDescriptor(
+      name='dst_extents', full_name='chromeos_update_engine.InstallOperation.dst_extents', index=5,
       number=6, type=11, cpp_type=10, label=3,
       has_default_value=False, default_value=[],
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
-      name='dst_length', full_name='chromeos_update_engine.DeltaArchiveManifest.InstallOperation.dst_length', index=6,
+    _descriptor.FieldDescriptor(
+      name='dst_length', full_name='chromeos_update_engine.InstallOperation.dst_length', index=6,
       number=7, type=4, cpp_type=4, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
-      name='data_sha256_hash', full_name='chromeos_update_engine.DeltaArchiveManifest.InstallOperation.data_sha256_hash', index=7,
+    _descriptor.FieldDescriptor(
+      name='data_sha256_hash', full_name='chromeos_update_engine.InstallOperation.data_sha256_hash', index=7,
       number=8, type=12, cpp_type=9, label=1,
-      has_default_value=False, default_value="",
+      has_default_value=False, default_value=_b(""),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      options=None),
+    _descriptor.FieldDescriptor(
+      name='src_sha256_hash', full_name='chromeos_update_engine.InstallOperation.src_sha256_hash', index=8,
+      number=9, type=12, cpp_type=9, label=1,
+      has_default_value=False, default_value=_b(""),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
@@ -315,176 +355,281 @@
   ],
   nested_types=[],
   enum_types=[
-    _DELTAARCHIVEMANIFEST_INSTALLOPERATION_TYPE,
+    _INSTALLOPERATION_TYPE,
   ],
   options=None,
   is_extendable=False,
   extension_ranges=[],
-  serialized_start=1083,
-  serialized_end=1492,
+  oneofs=[
+  ],
+  serialized_start=391,
+  serialized_end=844,
 )
 
-_DELTAARCHIVEMANIFEST = descriptor.Descriptor(
+
+_PARTITIONUPDATE = _descriptor.Descriptor(
+  name='PartitionUpdate',
+  full_name='chromeos_update_engine.PartitionUpdate',
+  filename=None,
+  file=DESCRIPTOR,
+  containing_type=None,
+  fields=[
+    _descriptor.FieldDescriptor(
+      name='partition_name', full_name='chromeos_update_engine.PartitionUpdate.partition_name', index=0,
+      number=1, type=9, cpp_type=9, label=2,
+      has_default_value=False, default_value=_b("").decode('utf-8'),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      options=None),
+    _descriptor.FieldDescriptor(
+      name='run_postinstall', full_name='chromeos_update_engine.PartitionUpdate.run_postinstall', index=1,
+      number=2, type=8, cpp_type=7, label=1,
+      has_default_value=False, default_value=False,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      options=None),
+    _descriptor.FieldDescriptor(
+      name='new_partition_signature', full_name='chromeos_update_engine.PartitionUpdate.new_partition_signature', index=2,
+      number=3, type=11, cpp_type=10, label=3,
+      has_default_value=False, default_value=[],
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      options=None),
+    _descriptor.FieldDescriptor(
+      name='old_partition_info', full_name='chromeos_update_engine.PartitionUpdate.old_partition_info', index=3,
+      number=4, type=11, cpp_type=10, label=1,
+      has_default_value=False, default_value=None,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      options=None),
+    _descriptor.FieldDescriptor(
+      name='new_partition_info', full_name='chromeos_update_engine.PartitionUpdate.new_partition_info', index=4,
+      number=5, type=11, cpp_type=10, label=1,
+      has_default_value=False, default_value=None,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      options=None),
+    _descriptor.FieldDescriptor(
+      name='operations', full_name='chromeos_update_engine.PartitionUpdate.operations', index=5,
+      number=6, type=11, cpp_type=10, label=3,
+      has_default_value=False, default_value=[],
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      options=None),
+  ],
+  extensions=[
+  ],
+  nested_types=[],
+  enum_types=[
+  ],
+  options=None,
+  is_extendable=False,
+  extension_ranges=[],
+  oneofs=[
+  ],
+  serialized_start=847,
+  serialized_end=1188,
+)
+
+
+_DELTAARCHIVEMANIFEST = _descriptor.Descriptor(
   name='DeltaArchiveManifest',
   full_name='chromeos_update_engine.DeltaArchiveManifest',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='install_operations', full_name='chromeos_update_engine.DeltaArchiveManifest.install_operations', index=0,
       number=1, type=11, cpp_type=10, label=3,
       has_default_value=False, default_value=[],
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='kernel_install_operations', full_name='chromeos_update_engine.DeltaArchiveManifest.kernel_install_operations', index=1,
       number=2, type=11, cpp_type=10, label=3,
       has_default_value=False, default_value=[],
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='block_size', full_name='chromeos_update_engine.DeltaArchiveManifest.block_size', index=2,
       number=3, type=13, cpp_type=3, label=1,
       has_default_value=True, default_value=4096,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='signatures_offset', full_name='chromeos_update_engine.DeltaArchiveManifest.signatures_offset', index=3,
       number=4, type=4, cpp_type=4, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='signatures_size', full_name='chromeos_update_engine.DeltaArchiveManifest.signatures_size', index=4,
       number=5, type=4, cpp_type=4, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='old_kernel_info', full_name='chromeos_update_engine.DeltaArchiveManifest.old_kernel_info', index=5,
       number=6, type=11, cpp_type=10, label=1,
       has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='new_kernel_info', full_name='chromeos_update_engine.DeltaArchiveManifest.new_kernel_info', index=6,
       number=7, type=11, cpp_type=10, label=1,
       has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='old_rootfs_info', full_name='chromeos_update_engine.DeltaArchiveManifest.old_rootfs_info', index=7,
       number=8, type=11, cpp_type=10, label=1,
       has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='new_rootfs_info', full_name='chromeos_update_engine.DeltaArchiveManifest.new_rootfs_info', index=8,
       number=9, type=11, cpp_type=10, label=1,
       has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='old_image_info', full_name='chromeos_update_engine.DeltaArchiveManifest.old_image_info', index=9,
       number=10, type=11, cpp_type=10, label=1,
       has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='new_image_info', full_name='chromeos_update_engine.DeltaArchiveManifest.new_image_info', index=10,
       number=11, type=11, cpp_type=10, label=1,
       has_default_value=False, default_value=None,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
-    descriptor.FieldDescriptor(
+    _descriptor.FieldDescriptor(
       name='minor_version', full_name='chromeos_update_engine.DeltaArchiveManifest.minor_version', index=11,
       number=12, type=13, cpp_type=3, label=1,
       has_default_value=True, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
+    _descriptor.FieldDescriptor(
+      name='partitions', full_name='chromeos_update_engine.DeltaArchiveManifest.partitions', index=12,
+      number=13, type=11, cpp_type=10, label=3,
+      has_default_value=False, default_value=[],
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      options=None),
   ],
   extensions=[
   ],
-  nested_types=[_DELTAARCHIVEMANIFEST_INSTALLOPERATION, ],
+  nested_types=[],
   enum_types=[
   ],
   options=None,
   is_extendable=False,
   extension_ranges=[],
-  serialized_start=391,
-  serialized_end=1492,
+  oneofs=[
+  ],
+  serialized_start=1191,
+  serialized_end=1899,
 )
 
-
-_SIGNATURES_SIGNATURE.containing_type = _SIGNATURES;
+_SIGNATURES_SIGNATURE.containing_type = _SIGNATURES
 _SIGNATURES.fields_by_name['signatures'].message_type = _SIGNATURES_SIGNATURE
-_DELTAARCHIVEMANIFEST_INSTALLOPERATION.fields_by_name['type'].enum_type = _DELTAARCHIVEMANIFEST_INSTALLOPERATION_TYPE
-_DELTAARCHIVEMANIFEST_INSTALLOPERATION.fields_by_name['src_extents'].message_type = _EXTENT
-_DELTAARCHIVEMANIFEST_INSTALLOPERATION.fields_by_name['dst_extents'].message_type = _EXTENT
-_DELTAARCHIVEMANIFEST_INSTALLOPERATION.containing_type = _DELTAARCHIVEMANIFEST;
-_DELTAARCHIVEMANIFEST_INSTALLOPERATION_TYPE.containing_type = _DELTAARCHIVEMANIFEST_INSTALLOPERATION;
-_DELTAARCHIVEMANIFEST.fields_by_name['install_operations'].message_type = _DELTAARCHIVEMANIFEST_INSTALLOPERATION
-_DELTAARCHIVEMANIFEST.fields_by_name['kernel_install_operations'].message_type = _DELTAARCHIVEMANIFEST_INSTALLOPERATION
+_INSTALLOPERATION.fields_by_name['type'].enum_type = _INSTALLOPERATION_TYPE
+_INSTALLOPERATION.fields_by_name['src_extents'].message_type = _EXTENT
+_INSTALLOPERATION.fields_by_name['dst_extents'].message_type = _EXTENT
+_INSTALLOPERATION_TYPE.containing_type = _INSTALLOPERATION
+_PARTITIONUPDATE.fields_by_name['new_partition_signature'].message_type = _SIGNATURES_SIGNATURE
+_PARTITIONUPDATE.fields_by_name['old_partition_info'].message_type = _PARTITIONINFO
+_PARTITIONUPDATE.fields_by_name['new_partition_info'].message_type = _PARTITIONINFO
+_PARTITIONUPDATE.fields_by_name['operations'].message_type = _INSTALLOPERATION
+_DELTAARCHIVEMANIFEST.fields_by_name['install_operations'].message_type = _INSTALLOPERATION
+_DELTAARCHIVEMANIFEST.fields_by_name['kernel_install_operations'].message_type = _INSTALLOPERATION
 _DELTAARCHIVEMANIFEST.fields_by_name['old_kernel_info'].message_type = _PARTITIONINFO
 _DELTAARCHIVEMANIFEST.fields_by_name['new_kernel_info'].message_type = _PARTITIONINFO
 _DELTAARCHIVEMANIFEST.fields_by_name['old_rootfs_info'].message_type = _PARTITIONINFO
 _DELTAARCHIVEMANIFEST.fields_by_name['new_rootfs_info'].message_type = _PARTITIONINFO
 _DELTAARCHIVEMANIFEST.fields_by_name['old_image_info'].message_type = _IMAGEINFO
 _DELTAARCHIVEMANIFEST.fields_by_name['new_image_info'].message_type = _IMAGEINFO
+_DELTAARCHIVEMANIFEST.fields_by_name['partitions'].message_type = _PARTITIONUPDATE
+DESCRIPTOR.message_types_by_name['Extent'] = _EXTENT
+DESCRIPTOR.message_types_by_name['Signatures'] = _SIGNATURES
+DESCRIPTOR.message_types_by_name['PartitionInfo'] = _PARTITIONINFO
+DESCRIPTOR.message_types_by_name['ImageInfo'] = _IMAGEINFO
+DESCRIPTOR.message_types_by_name['InstallOperation'] = _INSTALLOPERATION
+DESCRIPTOR.message_types_by_name['PartitionUpdate'] = _PARTITIONUPDATE
+DESCRIPTOR.message_types_by_name['DeltaArchiveManifest'] = _DELTAARCHIVEMANIFEST
 
-class Extent(message.Message):
-  __metaclass__ = reflection.GeneratedProtocolMessageType
-  DESCRIPTOR = _EXTENT
-  
+Extent = _reflection.GeneratedProtocolMessageType('Extent', (_message.Message,), dict(
+  DESCRIPTOR = _EXTENT,
+  __module__ = 'update_metadata_pb2'
   # @@protoc_insertion_point(class_scope:chromeos_update_engine.Extent)
+  ))
+_sym_db.RegisterMessage(Extent)
 
-class Signatures(message.Message):
-  __metaclass__ = reflection.GeneratedProtocolMessageType
-  
-  class Signature(message.Message):
-    __metaclass__ = reflection.GeneratedProtocolMessageType
-    DESCRIPTOR = _SIGNATURES_SIGNATURE
-    
+Signatures = _reflection.GeneratedProtocolMessageType('Signatures', (_message.Message,), dict(
+
+  Signature = _reflection.GeneratedProtocolMessageType('Signature', (_message.Message,), dict(
+    DESCRIPTOR = _SIGNATURES_SIGNATURE,
+    __module__ = 'update_metadata_pb2'
     # @@protoc_insertion_point(class_scope:chromeos_update_engine.Signatures.Signature)
-  DESCRIPTOR = _SIGNATURES
-  
+    ))
+  ,
+  DESCRIPTOR = _SIGNATURES,
+  __module__ = 'update_metadata_pb2'
   # @@protoc_insertion_point(class_scope:chromeos_update_engine.Signatures)
+  ))
+_sym_db.RegisterMessage(Signatures)
+_sym_db.RegisterMessage(Signatures.Signature)
 
-class PartitionInfo(message.Message):
-  __metaclass__ = reflection.GeneratedProtocolMessageType
-  DESCRIPTOR = _PARTITIONINFO
-  
+PartitionInfo = _reflection.GeneratedProtocolMessageType('PartitionInfo', (_message.Message,), dict(
+  DESCRIPTOR = _PARTITIONINFO,
+  __module__ = 'update_metadata_pb2'
   # @@protoc_insertion_point(class_scope:chromeos_update_engine.PartitionInfo)
+  ))
+_sym_db.RegisterMessage(PartitionInfo)
 
-class ImageInfo(message.Message):
-  __metaclass__ = reflection.GeneratedProtocolMessageType
-  DESCRIPTOR = _IMAGEINFO
-  
+ImageInfo = _reflection.GeneratedProtocolMessageType('ImageInfo', (_message.Message,), dict(
+  DESCRIPTOR = _IMAGEINFO,
+  __module__ = 'update_metadata_pb2'
   # @@protoc_insertion_point(class_scope:chromeos_update_engine.ImageInfo)
+  ))
+_sym_db.RegisterMessage(ImageInfo)
 
-class DeltaArchiveManifest(message.Message):
-  __metaclass__ = reflection.GeneratedProtocolMessageType
-  
-  class InstallOperation(message.Message):
-    __metaclass__ = reflection.GeneratedProtocolMessageType
-    DESCRIPTOR = _DELTAARCHIVEMANIFEST_INSTALLOPERATION
-    
-    # @@protoc_insertion_point(class_scope:chromeos_update_engine.DeltaArchiveManifest.InstallOperation)
-  DESCRIPTOR = _DELTAARCHIVEMANIFEST
-  
+InstallOperation = _reflection.GeneratedProtocolMessageType('InstallOperation', (_message.Message,), dict(
+  DESCRIPTOR = _INSTALLOPERATION,
+  __module__ = 'update_metadata_pb2'
+  # @@protoc_insertion_point(class_scope:chromeos_update_engine.InstallOperation)
+  ))
+_sym_db.RegisterMessage(InstallOperation)
+
+PartitionUpdate = _reflection.GeneratedProtocolMessageType('PartitionUpdate', (_message.Message,), dict(
+  DESCRIPTOR = _PARTITIONUPDATE,
+  __module__ = 'update_metadata_pb2'
+  # @@protoc_insertion_point(class_scope:chromeos_update_engine.PartitionUpdate)
+  ))
+_sym_db.RegisterMessage(PartitionUpdate)
+
+DeltaArchiveManifest = _reflection.GeneratedProtocolMessageType('DeltaArchiveManifest', (_message.Message,), dict(
+  DESCRIPTOR = _DELTAARCHIVEMANIFEST,
+  __module__ = 'update_metadata_pb2'
   # @@protoc_insertion_point(class_scope:chromeos_update_engine.DeltaArchiveManifest)
+  ))
+_sym_db.RegisterMessage(DeltaArchiveManifest)
 
+
+DESCRIPTOR.has_options = True
+DESCRIPTOR._options = _descriptor._ParseOptions(descriptor_pb2.FileOptions(), _b('H\003'))
 # @@protoc_insertion_point(module_scope)