Revert of Removed unused cricket::VideoCapturer methods

webrtc/pc/channelmanager.h

 /*
  *  Copyright 2004 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 111 matching lines @@
   // Gets capturer's supported formats in a thread safe manner
   std::vector<cricket::VideoFormat> GetSupportedFormats(
       VideoCapturer* capturer) const;
   // The following are done in the new "CaptureManager" style that
   // all local video capturers, processors, and managers should move to.
   // TODO(pthatcher): Make methods nicer by having start return a handle that
   // can be used for stop and restart, rather than needing to pass around
   // formats a a pseudo-handle.
   bool StartVideoCapture(VideoCapturer* video_capturer,
                          const VideoFormat& video_format);
+  // When muting, produce black frames then pause the camera.
+  // When unmuting, start the camera. Camera starts unmuted.
+  bool MuteToBlackThenPause(VideoCapturer* video_capturer, bool muted);
   bool StopVideoCapture(VideoCapturer* video_capturer,
                         const VideoFormat& video_format);
   bool RestartVideoCapture(VideoCapturer* video_capturer,
                            const VideoFormat& previous_format,
                            const VideoFormat& desired_format,
                            CaptureManager::RestartOptions options);
 
   virtual void AddVideoSink(VideoCapturer* video_capturer,
                             rtc::VideoSinkInterface<VideoFrame>* sink);
   virtual void RemoveVideoSink(VideoCapturer* video_capturer,
@@ skipping 70 matching lines @@
 
   int audio_output_volume_;
   bool enable_rtx_;
 
   bool capturing_;
 };
 
 }  // namespace cricket
 
 #endif  // TALK_SESSION_MEDIA_CHANNELMANAGER_H_