[GCM] Adding last token fetching time handling

components/gcm_driver/fake_gcm_driver.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/fake_gcm_driver.h"
 
 namespace gcm {
 
 FakeGCMDriver::FakeGCMDriver() {
 }
@@ skipping 72 matching lines @@
     const std::vector<GCMClient::AccountTokenInfo>& account_tokens) {
 }
 
 void FakeGCMDriver::UpdateAccountMapping(
     const AccountMapping& account_mapping) {
 }
 
 void FakeGCMDriver::RemoveAccountMapping(const std::string& account_id) {
 }
 
+base::Time FakeGCMDriver::GetLastTokenFetchTime() {
+  return base::Time();
+}
+
+void FakeGCMDriver::SetLastTokenFetchTime(const base::Time& time) {
+}
+
 }  // namespace gcm