Add CombinedDesktopMediaList.

chrome/browser/media/desktop_media_list_observer.h

 // Copyright 2013 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_DESKTOP_MEDIA_LIST_OBSERVER_H_
 #define CHROME_BROWSER_MEDIA_DESKTOP_MEDIA_LIST_OBSERVER_H_
 
+class DesktopMediaList;
+
 // Interface implemented by the desktop media picker dialog to receive
 // notifications about changes in DesktopMediaList.
 class DesktopMediaListObserver {
  public:
-  virtual void OnSourceAdded(int index) = 0;
-  virtual void OnSourceRemoved(int index) = 0;
-  virtual void OnSourceMoved(int old_index, int new_index) = 0;
-  virtual void OnSourceNameChanged(int index) = 0;
-  virtual void OnSourceThumbnailChanged(int index) = 0;
+  virtual void OnSourceAdded(DesktopMediaList* list, int index) = 0;
+  virtual void OnSourceRemoved(DesktopMediaList* list, int index) = 0;
+  virtual void OnSourceMoved(DesktopMediaList* list,
+                             int old_index,
+                             int new_index) = 0;
+  virtual void OnSourceNameChanged(DesktopMediaList* list, int index) = 0;
+  virtual void OnSourceThumbnailChanged(DesktopMediaList* list, int index) = 0;
 
  protected:
   virtual ~DesktopMediaListObserver() {}
 };
 
 #endif  // CHROME_BROWSER_MEDIA_DESKTOP_MEDIA_LIST_OBSERVER_H_