[GCM] Wiring heartbeat interval calls to GCMDriver

components/gcm_driver/fake_gcm_client.cc

Index: components/gcm_driver/fake_gcm_client.cc
diff --git a/components/gcm_driver/fake_gcm_client.cc b/components/gcm_driver/fake_gcm_client.cc
index ffa77d11db63188d38d4270d68306023faad89e2..50a4598d9369e33879690cf52b28cbdaa2032b75 100644
--- a/components/gcm_driver/fake_gcm_client.cc
+++ b/components/gcm_driver/fake_gcm_client.cc
@@ -148,6 +148,13 @@ std::string FakeGCMClient::GetInstanceIDData(const std::string& app_id) {
   return std::string();
 }
 
+void FakeGCMClient::AddHeartbeatInterval(const std::string& scope,
+                                         int interval_ms) {
+}
+
+void FakeGCMClient::RemoveHeartbeatInterval(const std::string& scope) {
+}
+
 void FakeGCMClient::PerformDelayedStart() {
   DCHECK(ui_thread_->RunsTasksOnCurrentThread());