Example of usage of new features of context and screen.

chrome/browser/ui/webui/chromeos/login/base_screen_handler.h

 // Copyright (c) 2012 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 CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_
 
 #include <string>
 
 #include "base/bind.h"
@@ skipping 182 matching lines @@
 
   template<typename T, typename A1, typename A2, typename A3, typename A4>
   void AddCallback(const std::string& name,
                    void (T::*method)(A1 arg1, A2 arg2, A3 arg3, A4 arg4)) {
     base::Callback<void(A1, A2, A3, A4)> callback =
         base::Bind(method, base::Unretained(static_cast<T*>(this)));
     web_ui()->RegisterMessageCallback(
         name, base::Bind(&CallbackWrapper4<A1, A2, A3, A4>, callback));
   }
 
+  template <typename Method>
+  void AddPrefixedCallback(const std::string& unprefixed_name,
+                           const Method& method) {
+    AddCallback(FullMethodPath(unprefixed_name), method);
+  }
+
   // Called when the page is ready and handler can do initialization.
   virtual void Initialize() = 0;
 
   // Show selected WebUI |screen|. Optionally it can pass screen initialization
   // data via |data| parameter.
   void ShowScreen(const char* screen, const base::DictionaryValue* data);
 
   // Whether page is ready.
   bool page_is_ready() const { return page_is_ready_; }
 
@@ skipping 19 matching lines @@
   // non empty value, the Initialize will be deferred until the underlying load
   // is finished.
   std::string async_assets_load_id_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_BASE_SCREEN_HANDLER_H_