handle the case when device is closed before media pipeline is fully initialized.

content/browser/renderer_host/media/video_capture_controller_event_handler.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_EVENT_HANDLER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_EVENT_HANDLER_H_
 
 #include "base/shared_memory.h"
 #include "base/time.h"
 #include "content/common/content_export.h"
 
@@ skipping 24 matching lines @@
   virtual void OnBufferReady(const VideoCaptureControllerID& id,
                              int buffer_id,
                              base::Time timestamp) = 0;
 
   // The frame resolution the VideoCaptureDevice capture video in.
   virtual void OnFrameInfo(const VideoCaptureControllerID& id,
                            int width,
                            int height,
                            int frame_rate) = 0;
 
+  // The capture session has been paused. No more frame will be sent.
+  virtual void OnPaused(const VideoCaptureControllerID& id) = 0;
+
   // Report that this object can be deleted.
   virtual void OnReadyToDelete(const VideoCaptureControllerID& id) = 0;
 
  protected:
   virtual ~VideoCaptureControllerEventHandler() {}
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_EVENT_HANDLER_H_