[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 c6f7d9e31bc5e87d6520a0af31c358721e41097a..15b41fda666ad774b0ae3f1152ee7e9495f9122e 100644
--- a/components/gcm_driver/fake_gcm_driver.cc
+++ b/components/gcm_driver/fake_gcm_driver.cc
@@ -102,4 +102,11 @@ InstanceIDStore* FakeGCMDriver::GetInstanceIDStore() {
   return NULL;
 }
 
+void FakeGCMDriver::AddHeartbeatInterval(const std::string& scope,
+                                         int interval_ms) {
+}
+
+void FakeGCMDriver::RemoveHeartbeatInterval(const std::string& scope) {
+}
+
 }  // namespace gcm