Extensions: Send the tab id to platform apps.

chrome/renderer/extensions/media_galleries_custom_bindings.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_RENDERER_EXTENSIONS_MEDIA_GALLERIES_CUSTOM_BINDINGS_H_
 #define CHROME_RENDERER_EXTENSIONS_MEDIA_GALLERIES_CUSTOM_BINDINGS_H_
 
 #include "chrome/renderer/extensions/chrome_v8_extension.h"
 
 namespace extensions {
 
 // Implements custom bindings for the media galleries API.
 class MediaGalleriesCustomBindings : public ChromeV8Extension {
  public:
+  static void PushSenderTabId(ChromeV8Context* context, int tab_id);
+  static void PopSenderTabId(ChromeV8Context* context);
+
   MediaGalleriesCustomBindings(Dispatcher* dispatcher,
                                ChromeV8Context* context);
 
  private:
+  void GetSenderTabId(ChromeV8Context* context,
+                      const v8::FunctionCallbackInfo<v8::Value>& args);
+
   DISALLOW_COPY_AND_ASSIGN(MediaGalleriesCustomBindings);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_MEDIA_GALLERIES_CUSTOM_BINDINGS_H_