Persist Instance ID data to GCM store.

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 2f82fbec91c434a9fddaf104e4f460ae921a4c30..ec69952ffc3f0cfbe6fc091547d90c4ffa6c6a72 100644
--- a/components/gcm_driver/gcm_driver_android.cc
+++ b/components/gcm_driver/gcm_driver_android.cc
@@ -162,6 +162,11 @@ void GCMDriverAndroid::SetLastTokenFetchTime(const base::Time& time) {
 void GCMDriverAndroid::WakeFromSuspendForHeartbeat(bool wake) {
 }
 
+InstanceIDStore* GCMDriverAndroid::GetInstanceIDStore() {
+  // Not supported for Android.
+  return NULL;
+}
+
 GCMClient::Result GCMDriverAndroid::EnsureStarted(
     GCMClient::StartMode start_mode) {
   // TODO(johnme): Maybe we should check if GMS is available?