Skeleton GCMAppHandler for Push API

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 16 matching lines @@
                               GCMClient::Result result)> RegisterCallback;
   typedef base::Callback<void(const std::string& message_id,
                               GCMClient::Result result)> SendCallback;
   typedef base::Callback<void(GCMClient::Result result)> UnregisterCallback;
   typedef base::Callback<void(const GCMClient::GCMStatistics& stats)>
       GetGCMStatisticsCallback;
 
   GCMDriver();
   virtual ~GCMDriver();
 
+  void SetLazyLoadAppHandlersClosure(
+      const base::Closure& lazy_load_app_handlers);
+
   // Registers |sender_id| for an app. A registration ID will be returned by
   // the GCM server.
   // |app_id|: application ID.
   // |sender_ids|: list of IDs of the servers that are allowed to send the
   //               messages to the application. These IDs are assigned by the
   //               Google API Console.
   // |callback|: to be called once the asynchronous operation is done.
   void Register(const std::string& app_id,
                 const std::vector<std::string>& sender_ids,
                 const RegisterCallback& callback);
@@ skipping 103 matching lines @@
   // Callback map (from <app_id, message_id> to callback) for Send.
   std::map<std::pair<std::string, std::string>, SendCallback> send_callbacks_;
 
   // App handler map (from app_id to handler pointer).
   // The handler is not owned.
   GCMAppHandlerMap app_handlers_;
 
   // The default handler when no app handler can be found in the map.
   DefaultGCMAppHandler default_app_handler_;
 
+  // Called before the first time GetAppHandler is run, to allow consumers
+  // to register app handlers on demand.

[fgorski, 2014/06/10 17:09:28]

Please explain that scenario a bit better in response. I am not sure I follow.

[johnme, 2014/06/10 20:33:48]

Replied out of band by email.

+  base::Closure lazy_load_app_handlers_;
+
   DISALLOW_COPY_AND_ASSIGN(GCMDriver);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_DRIVER_H_