Teach the GCM Driver how to decrypt incoming messages.

components/gcm_driver/gcm_driver.h

Index: components/gcm_driver/gcm_driver.h
diff --git a/components/gcm_driver/gcm_driver.h b/components/gcm_driver/gcm_driver.h
index 572c02d8b793d035901b76021e924d4dbd04f9de..b41024e2bcbe37961574f523d274d189be3f2332 100644
--- a/components/gcm_driver/gcm_driver.h
+++ b/components/gcm_driver/gcm_driver.h
@@ -267,6 +267,12 @@ class GCMDriver {
 
   void ClearCallbacks();
 
+  // Dispatches the OnMessage event to the app handler associated with |app_id|.
+  // If the |message| has been encrypted, it will be asynchronously decrypted

[Michael van Ouwerkerk, 2015/10/02 14:30:42]

nit: This left me wondering whether it will be dispatched synchronously when it
is not encrypted.

[Peter Beverloo, 2015/10/02 15:01:22]

Done.

+  // before being dispatched to the handler associated with |app_id|.
+  void DispatchMessage(const std::string& app_id,
+                       const IncomingMessage& message);
+
  private:
   // Common code shared by Unregister and UnregisterWithSenderId.
   void UnregisterInternal(const std::string& app_id,