getUserMeida: report device starting states

media/capture/video/video_capture_device_client.h

 // Copyright 2015 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 MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_DEVICE_CLIENT_H_
 #define MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_DEVICE_CLIENT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 63 matching lines @@
       base::TimeDelta timestamp,
       gfx::Rect visible_rect,
       const VideoFrameMetadata& additional_metadata) override;
   Buffer ResurrectLastOutputBuffer(const gfx::Size& dimensions,
                                    media::VideoPixelFormat format,
                                    media::VideoPixelStorage storage,
                                    int new_frame_feedback_id) override;
   void OnError(const tracked_objects::Location& from_here,
                const std::string& reason) override;
   void OnLog(const std::string& message) override;
+  void OnStarted() override;
   double GetBufferPoolUtilization() const override;
 
  private:
   void InitializeI420PlanePointers(const gfx::Size& dimensions,
                                    uint8_t* const data,
                                    uint8_t** y_plane_data,
                                    uint8_t** u_plane_data,
                                    uint8_t** v_plane_data);
 
   // A branch of OnIncomingCapturedData for Y16 frame_format.pixel_format.
@@ skipping 31 matching lines @@
   // concurrently. Producers are allowed to call from multiple threads, but not
   // concurrently.
   DFAKE_MUTEX(call_from_producer_);
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceClient);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_DEVICE_CLIENT_H_