Teach the GCM Driver how to decrypt incoming messages.

components/gcm_driver/gcm_driver.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_GCM_DRIVER_GCM_DRIVER_H_
 #define COMPONENTS_GCM_DRIVER_GCM_DRIVER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 249 matching lines @@
 
   // Runs the Send callback.
   void SendFinished(const std::string& app_id,
                     const std::string& message_id,
                     GCMClient::Result result);
 
   bool HasRegisterCallback(const std::string& app_id);
 
   void ClearCallbacks();
 
+  // Dispatches the OnMessage event to the app handler associated with |app_id|.
+  // If |message| has been encrypted, it will be decrypted asynchronously and
+  // dispatched when the decryption operation was successful. Otherwise, the
+  // |message| will be dispatched immediately to the handler for |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,
                           const std::string* sender_id,
                           const UnregisterCallback& callback);
 
   // Called after unregistration completes in order to trigger the pending
   // registration.
   void RegisterAfterUnregister(
       const std::string& app_id,
@@ skipping 22 matching lines @@
   DefaultGCMAppHandler default_app_handler_;
 
   base::WeakPtrFactory<GCMDriver> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMDriver);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_DRIVER_H_