Begin adding support for tab mirroring via the MediaStream audio/video capturing

chrome/browser/media/media_stream_devices_menu_model.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_MEDIA_MEDIA_STREAM_DEVICES_MENU_MODEL_H_
 #define CHROME_BROWSER_MEDIA_MEDIA_STREAM_DEVICES_MENU_MODEL_H_
 
 #include <map>
 #include <string>
 
 #include "content/public/common/media_stream_request.h"
 #include "ui/base/models/simple_menu_model.h"
 
 class MediaStreamInfoBarDelegate;
 
 // A menu model that builds the contents of the devices menu in the media stream
 // infobar. This menu has only one level (no submenus).
 class MediaStreamDevicesMenuModel : public ui::SimpleMenuModel,
                                     public ui::SimpleMenuModel::Delegate {
  public:
   explicit MediaStreamDevicesMenuModel(
       const MediaStreamInfoBarDelegate* delegate);
   virtual ~MediaStreamDevicesMenuModel();
 
-  // Returns the |device_id| for the selected device of type |type|. Returns
-  // true if a selected device of the requested |type| was found, and false if
-  // none was found, in which case |device_id| remains untouched.
-  bool GetSelectedDeviceId(
-      content::MediaStreamDeviceType type,
-      std::string* device_id) const;
+  // Returns the |device_id| for the selected audio/video device. Returns true
+  // if a selected device was found, or false if none was found, in which case
+  // |device_id| remains untouched.
+  bool GetSelectedAudioDeviceId(std::string* device_id) const;
+  bool GetSelectedVideoDeviceId(std::string* device_id) const;
 
   bool always_allow() const { return always_allow_; }
 
   // ui::SimpleMenuModel::Delegate implementation:
   virtual bool IsCommandIdChecked(int command_id) const OVERRIDE;
   virtual bool IsCommandIdEnabled(int command_id) const OVERRIDE;
   virtual bool GetAcceleratorForCommandId(
       int command_id,
       ui::Accelerator* accelerator) OVERRIDE;
   virtual void ExecuteCommand(int command_id) OVERRIDE;
@@ skipping 14 matching lines @@
   // devices entries in the menu, or -1 if there is no selected ID.
   int selected_command_id_audio_;
   int selected_command_id_video_;
 
   bool always_allow_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamDevicesMenuModel);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_MEDIA_STREAM_DEVICES_MENU_MODEL_H_