[GCM] Update ResetStore histograms

components/gcm_driver/gcm_client_impl_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/gcm_driver/gcm_client_impl.h"
 
 #include <stdint.h>
 
 #include <initializer_list>
 #include <memory>
@@ skipping 671 matching lines @@
   gcm_client()->Stop();
   PumpLoopUntilIdle();
 
   // Mess up the store.
   base::FilePath store_file_path =
       gcm_store_path().Append(FILE_PATH_LITERAL("CURRENT"));
   ASSERT_TRUE(base::AppendToFile(store_file_path, "A", 1));
 
   // Restart GCM client. The store should be reset and the loading should
   // complete successfully.
+
+  base::HistogramTester histogram_tester;
   reset_last_event();
   BuildGCMClient(base::TimeDelta());
   InitializeGCMClient();
   StartGCMClient();
+  histogram_tester.ExpectUniqueSample("GCM.ResetStoreReason",
+                                      0 /* Loading failed. */, 1);
   ASSERT_NO_FATAL_FAILURE(
       CompleteCheckin(kDeviceAndroidId2, kDeviceSecurityToken2, std::string(),
                       std::map<std::string, std::string>()));
 
   EXPECT_EQ(LOADING_COMPLETED, last_event());
   EXPECT_EQ(kDeviceAndroidId2, mcs_client()->last_android_id());
   EXPECT_EQ(kDeviceSecurityToken2, mcs_client()->last_security_token());
 }
 
 TEST_F(GCMClientImplTest, LoadingWithEmptyDirectory) {
@@ skipping 528 matching lines @@
   EXPECT_TRUE(device_checkin_info().accounts_set);
   EXPECT_EQ(MakeEmailToTokenMap(account_tokens),
             device_checkin_info().account_tokens);
 }
 
 TEST_F(GCMClientImplCheckinTest, ResetStoreWhenCheckinRejected) {
   base::HistogramTester histogram_tester;
   std::map<std::string, std::string> settings;
   ASSERT_NO_FATAL_FAILURE(FailCheckin(net::HTTP_UNAUTHORIZED));
   PumpLoopUntilIdle();
+  histogram_tester.ExpectUniqueSample("GCM.ResetStoreReason",
+                                      1 /* Checkin rejected. */, 1);
 
   // Store should have been destroyed. Restart client and verify the initial
   // checkin response is persisted.
   BuildGCMClient(base::TimeDelta());
   InitializeGCMClient();
   StartGCMClient();
   ASSERT_NO_FATAL_FAILURE(
       CompleteCheckin(kDeviceAndroidId2, kDeviceSecurityToken2,
                       GServicesSettings::CalculateDigest(settings), settings));
 
@@ skipping 661 matching lines @@
   ReceiveMessageFromMCS(message);
 
   EXPECT_EQ(MESSAGE_RECEIVED, last_event());
   EXPECT_EQ(kExtensionAppId, last_app_id());
   EXPECT_EQ(expected_data.size(), last_message().data.size());
   EXPECT_EQ(expected_data, last_message().data);
   EXPECT_EQ(kSender, last_message().sender_id);
 }
 
 }  // namespace gcm