Retrieve client_id from GoogleUpdateSettings when its missing from Local State.

chrome/browser/metrics/extensions_metrics_provider_unittest.cc

Index: chrome/browser/metrics/extensions_metrics_provider_unittest.cc
diff --git a/chrome/browser/metrics/extensions_metrics_provider_unittest.cc b/chrome/browser/metrics/extensions_metrics_provider_unittest.cc
index f0fc87e2d68fc2cab17ff7a4eb5721758a430a3a..157ab5255ef27d2db71ff7a44aa17d1e5fac645b 100644
--- a/chrome/browser/metrics/extensions_metrics_provider_unittest.cc
+++ b/chrome/browser/metrics/extensions_metrics_provider_unittest.cc
@@ -6,7 +6,9 @@
 
 #include <string>
 
+#include "base/memory/scoped_ptr.h"
 #include "base/prefs/testing_pref_service.h"
+#include "components/metrics/client_info.h"
 #include "components/metrics/metrics_state_manager.h"
 #include "components/metrics/proto/system_profile.pb.h"
 #include "extensions/common/extension.h"
@@ -20,6 +22,13 @@ bool IsMetricsReportingEnabled() {
   return true;
 }
 
+void StoreNoClientInfoBackup(const metrics::ClientInfo& /* client_info */) {
+}
+
+scoped_ptr<metrics::ClientInfo> ReturnNoBackup() {
+  return scoped_ptr<metrics::ClientInfo>();
+}
+
 class TestExtensionsMetricsProvider : public ExtensionsMetricsProvider {
  public:
   explicit TestExtensionsMetricsProvider(
@@ -95,8 +104,11 @@ TEST(ExtensionsMetricsProvider, SystemProtoEncoding) {
   TestingPrefServiceSimple local_state;
   metrics::MetricsStateManager::RegisterPrefs(local_state.registry());
   scoped_ptr<metrics::MetricsStateManager> metrics_state_manager(
-      metrics::MetricsStateManager::Create(&local_state,
-                base::Bind(&IsMetricsReportingEnabled)));
+      metrics::MetricsStateManager::Create(
+          &local_state,
+          base::Bind(&IsMetricsReportingEnabled),
+          base::Bind(&StoreNoClientInfoBackup),
+          base::Bind(&ReturnNoBackup)));
   TestExtensionsMetricsProvider extension_metrics(metrics_state_manager.get());
   extension_metrics.ProvideSystemProfileMetrics(&system_profile);
   ASSERT_EQ(2, system_profile.occupied_extension_bucket_size());