Make extension callbacks with auto-dismissing dialogs

components/app_modal/javascript_dialog_manager.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 COMPONENTS_APP_MODAL_JAVASCRIPT_DIALOG_MANAGER_H_
 #define COMPONENTS_APP_MODAL_JAVASCRIPT_DIALOG_MANAGER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 18 matching lines @@
   // Sets the JavaScriptNativeDialogFactory used to create platform specific
   // dialog window instances.
   void SetNativeDialogFactory(
       std::unique_ptr<JavaScriptNativeDialogFactory> factory);
 
   // JavaScript dialogs may be opened by an extensions/app, thus they need
   // access to extensions functionality. This sets a client interface to
   // access //extensions.
   void SetExtensionsClient(
       std::unique_ptr<JavaScriptDialogExtensionsClient> extensions_client);
+  JavaScriptDialogExtensionsClient* GetExtensionsClient();
 
   // Gets the title for a dialog.
   base::string16 GetTitle(content::WebContents* web_contents,
                           const GURL& origin_url);
 
   // JavaScriptDialogManager:
   void RunJavaScriptDialog(content::WebContents* web_contents,
                            const GURL& origin_url,
                            content::JavaScriptDialogType dialog_type,
                            const base::string16& message_text,
@@ skipping 39 matching lines @@
   // dialogs. (Since Javascript dialogs are modal, this is even accurate!)
   base::TimeTicks last_close_time_;
   base::TimeTicks last_creation_time_;
 
   DISALLOW_COPY_AND_ASSIGN(JavaScriptDialogManager);
 };
 
 }  // namespace app_modal
 
 #endif  // COMPONENTS_APP_MODAL_JAVASCRIPT_DIALOG_MANAGER_H_