Retrieve client_id from GoogleUpdateSettings when its missing from Local State.

components/metrics/metrics_service_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/metrics/metrics_service.h"
 
 #include <string>
 
 #include "base/bind.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/testing_pref_service.h"
 #include "base/threading/platform_thread.h"
+#include "components/metrics/client_info.h"
 #include "components/metrics/compression_utils.h"
 #include "components/metrics/metrics_log.h"
 #include "components/metrics/metrics_pref_names.h"
 #include "components/metrics/metrics_service_observer.h"
 #include "components/metrics/metrics_state_manager.h"
 #include "components/metrics/test_metrics_service_client.h"
 #include "components/variations/metrics_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 using metrics::MetricsLogManager;
 
+void StoreNoClientInfoBackup(const metrics::ClientInfo& /* client_info */) {
+}
+
+scoped_ptr<metrics::ClientInfo> ReturnNoBackup() {
+  return scoped_ptr<metrics::ClientInfo>();
+}
+
 class TestMetricsService : public MetricsService {
  public:
   TestMetricsService(metrics::MetricsStateManager* state_manager,
                      metrics::MetricsServiceClient* client,
                      PrefService* local_state)
       : MetricsService(state_manager, client, local_state) {}
   virtual ~TestMetricsService() {}
 
   using MetricsService::log_manager;
 
@@ skipping 19 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(TestMetricsLog);
 };
 
 class MetricsServiceTest : public testing::Test {
  public:
   MetricsServiceTest() : is_metrics_reporting_enabled_(false) {
     MetricsService::RegisterPrefs(testing_local_state_.registry());
     metrics_state_manager_ = metrics::MetricsStateManager::Create(
         GetLocalState(),
         base::Bind(&MetricsServiceTest::is_metrics_reporting_enabled,
-                   base::Unretained(this)));
+                   base::Unretained(this)),
+        base::Bind(&StoreNoClientInfoBackup),
+        base::Bind(&ReturnNoBackup));
   }
 
   virtual ~MetricsServiceTest() {
     MetricsService::SetExecutionPhase(MetricsService::UNINITIALIZED_PHASE,
                                       GetLocalState());
   }
 
   metrics::MetricsStateManager* GetMetricsStateManager() {
     return metrics_state_manager_.get();
   }
@@ skipping 220 matching lines @@
 
   service.RemoveObserver(&observer1);
 
   service.OpenNewLog();
   EXPECT_EQ(2, observer1.observed());
   EXPECT_EQ(2, observer2.observed());
   service.log_manager_.FinishCurrentLog();
 
   service.RemoveObserver(&observer2);
 }