[GCM] Adding last token fetching time handling

components/gcm_driver/gcm_driver_android.cc

Index: components/gcm_driver/gcm_driver_android.cc
diff --git a/components/gcm_driver/gcm_driver_android.cc b/components/gcm_driver/gcm_driver_android.cc
index bee1980153d078e8f7654e704594bc578aecf427..c31b58537c7e7dc2336232114a05faa153419914 100644
--- a/components/gcm_driver/gcm_driver_android.cc
+++ b/components/gcm_driver/gcm_driver_android.cc
@@ -153,6 +153,15 @@ void GCMDriverAndroid::RemoveAccountMapping(const std::string& account_id) {
   NOTIMPLEMENTED();
 }
 
+base::Time GCMDriverAndroid::GetLastTokenFetchTime() {
+  NOTIMPLEMENTED();
+  return base::Time();
+}
+
+void GCMDriverAndroid::SetLastTokenFetchTime(const base::Time& time) {
+  NOTIMPLEMENTED();
+}
+
 GCMClient::Result GCMDriverAndroid::EnsureStarted() {
   // TODO(johnme): Maybe we should check if GMS is available?
   return GCMClient::SUCCESS;