diff --git a/metrics/metrics_daemon.cc b/metrics/metrics_daemon.cc
index 4a69d8b..4ea899f 100644
--- a/metrics/metrics_daemon.cc
+++ b/metrics/metrics_daemon.cc
@@ -191,6 +191,7 @@
 void MetricsDaemon::RunUploaderTest() {
   upload_service_.reset(new UploadService(new SystemProfileCache(true,
                                                                  config_root_),
+                                          metrics_lib_,
                                           server_));
   upload_service_->Init(upload_interval_, metrics_file_);
   upload_service_->UploadEvent();
@@ -341,7 +342,7 @@
     if (IsOnOfficialBuild()) {
       LOG(INFO) << "uploader enabled";
       upload_service_.reset(
-          new UploadService(new SystemProfileCache(), server_));
+          new UploadService(new SystemProfileCache(), metrics_lib_, server_));
       upload_service_->Init(upload_interval_, metrics_file_);
     } else {
       LOG(INFO) << "uploader disabled on non-official build";
diff --git a/metrics/metrics_library.h b/metrics/metrics_library.h
index 24db112..a90f3e6 100644
--- a/metrics/metrics_library.h
+++ b/metrics/metrics_library.h
@@ -19,6 +19,7 @@
 class MetricsLibraryInterface {
  public:
   virtual void Init() = 0;
+  virtual bool AreMetricsEnabled() = 0;
   virtual bool SendToUMA(const std::string& name, int sample,
                          int min, int max, int nbuckets) = 0;
   virtual bool SendEnumToUMA(const std::string& name, int sample, int max) = 0;
@@ -40,7 +41,7 @@
   bool IsGuestMode();
 
   // Returns whether or not metrics collection is enabled.
-  bool AreMetricsEnabled();
+  bool AreMetricsEnabled() override;
 
   // Sends histogram data to Chrome for transport to UMA and returns
   // true on success. This method results in the equivalent of an
diff --git a/metrics/metrics_library_mock.h b/metrics/metrics_library_mock.h
index 0f1047f..99892bf 100644
--- a/metrics/metrics_library_mock.h
+++ b/metrics/metrics_library_mock.h
@@ -13,6 +13,8 @@
 
 class MetricsLibraryMock : public MetricsLibraryInterface {
  public:
+  bool metrics_enabled_ = true;
+
   MOCK_METHOD0(Init, void());
   MOCK_METHOD5(SendToUMA, bool(const std::string& name, int sample,
                                int min, int max, int nbuckets));
@@ -20,6 +22,8 @@
                                    int max));
   MOCK_METHOD2(SendSparseToUMA, bool(const std::string& name, int sample));
   MOCK_METHOD1(SendUserActionToUMA, bool(const std::string& action));
+
+  bool AreMetricsEnabled() override {return metrics_enabled_;};
 };
 
 #endif  // METRICS_METRICS_LIBRARY_MOCK_H_
diff --git a/metrics/uploader/upload_service.cc b/metrics/uploader/upload_service.cc
index dd49d1f..92c9e10 100644
--- a/metrics/uploader/upload_service.cc
+++ b/metrics/uploader/upload_service.cc
@@ -26,17 +26,20 @@
 const int UploadService::kMaxFailedUpload = 10;
 
 UploadService::UploadService(SystemProfileSetter* setter,
+                             MetricsLibraryInterface* metrics_lib,
                              const std::string& server)
     : system_profile_setter_(setter),
+      metrics_lib_(metrics_lib),
       histogram_snapshot_manager_(this),
       sender_(new HttpSender(server)),
       testing_(false) {
 }
 
 UploadService::UploadService(SystemProfileSetter* setter,
+                             MetricsLibraryInterface* metrics_lib,
                              const std::string& server,
                              bool testing)
-    : UploadService(setter, server) {
+    : UploadService(setter, metrics_lib, server) {
   testing_ = testing;
 }
 
@@ -94,6 +97,13 @@
 void UploadService::SendStagedLog() {
   CHECK(staged_log_) << "staged_log_ must exist to be sent";
 
+  // If metrics are not enabled, discard the log and exit.
+  if (!metrics_lib_->AreMetricsEnabled()) {
+    LOG(INFO) << "Metrics disabled. Don't upload metrics samples.";
+    staged_log_.reset();
+    return;
+  }
+
   std::string log_text;
   staged_log_->GetEncodedLog(&log_text);
   if (!sender_->Send(log_text, base::SHA1HashString(log_text))) {
diff --git a/metrics/uploader/upload_service.h b/metrics/uploader/upload_service.h
index 0b087de..ebbb54f 100644
--- a/metrics/uploader/upload_service.h
+++ b/metrics/uploader/upload_service.h
@@ -10,6 +10,8 @@
 #include "base/metrics/histogram_base.h"
 #include "base/metrics/histogram_flattener.h"
 #include "base/metrics/histogram_snapshot_manager.h"
+
+#include "metrics/metrics_library.h"
 #include "metrics/uploader/metrics_log.h"
 #include "metrics/uploader/sender.h"
 #include "metrics/uploader/system_profile_cache.h"
@@ -55,6 +57,7 @@
 class UploadService : public base::HistogramFlattener {
  public:
   explicit UploadService(SystemProfileSetter* setter,
+                         MetricsLibraryInterface* metrics_lib,
                          const std::string& server);
 
   void Init(const base::TimeDelta& upload_interval,
@@ -99,6 +102,7 @@
 
   // Private constructor for use in unit testing.
   UploadService(SystemProfileSetter* setter,
+                MetricsLibraryInterface* metrics_lib,
                 const std::string& server,
                 bool testing);
 
@@ -134,6 +138,7 @@
   MetricsLog* GetOrCreateCurrentLog();
 
   scoped_ptr<SystemProfileSetter> system_profile_setter_;
+  MetricsLibraryInterface* metrics_lib_;
   base::HistogramSnapshotManager histogram_snapshot_manager_;
   scoped_ptr<Sender> sender_;
   int failed_upload_count_;
diff --git a/metrics/uploader/upload_service_test.cc b/metrics/uploader/upload_service_test.cc
index ca90e85..d04cc72 100644
--- a/metrics/uploader/upload_service_test.cc
+++ b/metrics/uploader/upload_service_test.cc
@@ -12,6 +12,7 @@
 #include "components/metrics/proto/chrome_user_metrics_extension.pb.h"
 #include "components/metrics/proto/histogram_event.pb.h"
 #include "components/metrics/proto/system_profile.pb.h"
+#include "metrics/metrics_library_mock.h"
 #include "metrics/serialization/metric_sample.h"
 #include "metrics/uploader/metrics_log.h"
 #include "metrics/uploader/mock/mock_system_profile_setter.h"
@@ -26,7 +27,8 @@
  protected:
   UploadServiceTest()
       : cache_(true, "/"),
-        upload_service_(new MockSystemProfileSetter(), kMetricsServer, true),
+        upload_service_(new MockSystemProfileSetter(), &metrics_lib_,
+                        kMetricsServer, true),
         exit_manager_(new base::AtExitManager()) {
     sender_ = new SenderMock;
     upload_service_.sender_.reset(sender_);
@@ -52,6 +54,7 @@
   SenderMock* sender_;
   SystemProfileCache cache_;
   UploadService upload_service_;
+  MetricsLibraryMock metrics_lib_;
 
   scoped_ptr<base::AtExitManager> exit_manager_;
 };
@@ -126,7 +129,8 @@
 }
 
 TEST_F(UploadServiceTest, LogEmptyByDefault) {
-  UploadService upload_service(new MockSystemProfileSetter(), kMetricsServer);
+  UploadService upload_service(new MockSystemProfileSetter(), &metrics_lib_,
+                               kMetricsServer);
 
   // current_log_ should be initialized later as it needs AtExitManager to exit
   // in order to gather system information from SysInfo.