Follow up: stop mirroring session when tab is closed.

content/renderer/media/media_stream_video_capturer_source.h

 // Copyright 2014 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_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 40 matching lines @@
   void StartSourceImpl(
       const media::VideoCaptureFormat& format,
       const blink::WebMediaConstraints& constraints,
       const VideoCaptureDeliverFrameCB& frame_callback) override;
   void StopSourceImpl() override;
 
   // RenderFrameObserver implementation.
   void OnDestruct() final {}
 
   // Method to bind as RunningCallback in VideoCapturerSource::StartCapture().
-  void OnStarted(bool result);
+  void OnRunStateChanged(bool is_running);
 
   const char* GetPowerLineFrequencyForTesting() const;
 
   // The source that provides video frames.
   const std::unique_ptr<media::VideoCapturerSource> source_;
 
+  // Indicates whether the capture is in starting. It is set to true by
+  // StartSourceImpl() when starting the capture, and is reset after starting
+  // is completed.
+  bool is_capture_starting_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoCapturerSource);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_