[GCM] Wiring heartbeat interval calls to GCMDriver

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 45791f60899ad89731974c0421bbe1314aab45d5..0df7de886cb323d76a962fb744ddd1690e1629f1 100644
--- a/components/gcm_driver/fake_gcm_driver.cc
+++ b/components/gcm_driver/fake_gcm_driver.cc
@@ -98,4 +98,11 @@ void FakeGCMDriver::SetLastTokenFetchTime(const base::Time& time) {
 void FakeGCMDriver::WakeFromSuspendForHeartbeat(bool wake) {
 }
 
+void FakeGCMDriver::AddHeartbeatInterval(const std::string& scope,
+                                         int interval_ms) {
+}
+
+void FakeGCMDriver::RemoveHeartbeatInterval(const std::string& scope) {
+}
+
 }  // namespace gcm