Interface for requestSources through UserMediaController/Client.

public/web/WebUserMediaClient.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebUserMediaClient_h
 #define WebUserMediaClient_h
 
 namespace blink {
 
 class WebMediaDevicesRequest;
+class WebMediaStreamTrackSourcesRequest;
 class WebUserMediaRequest;
 template <typename T> class WebVector;
 
 class WebUserMediaClient {
 public:
     virtual ~WebUserMediaClient() { }
 
     virtual void requestUserMedia(const WebUserMediaRequest&) = 0;
     virtual void cancelUserMediaRequest(const WebUserMediaRequest&) = 0;
     virtual void requestMediaDevices(const WebMediaDevicesRequest&) = 0;
     virtual void cancelMediaDevicesRequest(const WebMediaDevicesRequest&) = 0;
+    virtual void requestSources(const WebMediaStreamTrackSourcesRequest&) { };
 };
 
 } // namespace blink
 
 #endif // WebUserMediaClient_h