[GCM] Add app handler support for connection events

components/gcm_driver/fake_gcm_driver.cc

Index: components/gcm_driver/fake_gcm_driver.cc
diff --git a/components/gcm_driver/fake_gcm_driver.cc b/components/gcm_driver/fake_gcm_driver.cc
index 712360b210b6c928ef6d5a91e098fab9ae52f0f7..a4173e8e82ed512052b181d72429b0ea3101c3fd 100644
--- a/components/gcm_driver/fake_gcm_driver.cc
+++ b/components/gcm_driver/fake_gcm_driver.cc
@@ -40,6 +40,10 @@ bool FakeGCMDriver::IsGCMClientReady() const {
   return true;
 }
 
+bool FakeGCMDriver::IsConnected() const {
+  return true;
+}
+
 void FakeGCMDriver::GetGCMStatistics(const GetGCMStatisticsCallback& callback,
                                      bool clear_logs) {
 }