Notify GCMAppHandlers when the store is reset, so they clear cached IDs

components/gcm_driver/gcm_app_handler.h

Index: components/gcm_driver/gcm_app_handler.h
diff --git a/components/gcm_driver/gcm_app_handler.h b/components/gcm_driver/gcm_app_handler.h
index 4ee8b906167f68bdf3bf52c44fcda9ba38b7c83b..0390984c708fef444444beeac7ca974a99ea1602 100644
--- a/components/gcm_driver/gcm_app_handler.h
+++ b/components/gcm_driver/gcm_app_handler.h
@@ -23,6 +23,11 @@ class GCMAppHandler {
   // make safe for ShutdownHandler to be called multiple times.
   virtual void ShutdownHandler() = 0;
 
+  // Called when the GCM store is reset (e.g. due to corruption), which changes
+  // the device ID, invalidating all prior registrations. Any stored
+  // registration IDs should be deleted.

[Peter Beverloo, 2016/11/03 17:28:57]

Maybe broaden this to "Any stored state related to GCM registrations should be
deleted." ?

[johnme, 2016/11/08 19:22:41]

Done (also mentioned InstanceIDs).

+  virtual void OnStoreReset() = 0;
+
   // Called when a GCM message has been received.
   virtual void OnMessage(const std::string& app_id,
                          const IncomingMessage& message) = 0;