Add a flag in StopCapture to allow event handler to choose event notification.

media/video/capture/video_capture.h

 // Copyright (c) 2011 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.
 //
 // This file contains abstract classes used for media filter to handle video
 // capture devices.
 
 #ifndef MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_H_
 #define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_H_
 
@@ skipping 79 matching lines @@
 
   VideoCapture() {}
   virtual ~VideoCapture() {}
 
   // Request video capture to start capturing with |capability|.
   // Also register |handler| with video capture for event handling.
   virtual void StartCapture(EventHandler* handler,
                             const VideoCaptureCapability& capability) = 0;
 
   // Request video capture to stop capturing for client |handler|.
-  virtual void StopCapture(EventHandler* handler) = 0;
+  virtual void StopCapture(EventHandler* handler, bool need_notification) = 0;
 
   // Feed buffer to video capture when done with it.
   virtual void FeedBuffer(scoped_refptr<VideoFrameBuffer> buffer) = 0;
 
   virtual bool CaptureStarted() = 0;
   virtual int CaptureWidth() = 0;
   virtual int CaptureHeight() = 0;
   virtual int CaptureFrameRate() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoCapture);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_H_