getUserMeida: report device starting states

content/browser/renderer_host/media/video_capture_host.h

Index: content/browser/renderer_host/media/video_capture_host.h
diff --git a/content/browser/renderer_host/media/video_capture_host.h b/content/browser/renderer_host/media/video_capture_host.h
index a92ac9a466e422c90c598d51ba5723fec7fe833f..30d26057cbe1126a79274196ad9f9e573ee3033e 100644
--- a/content/browser/renderer_host/media/video_capture_host.h
+++ b/content/browser/renderer_host/media/video_capture_host.h
@@ -50,6 +50,7 @@ class CONTENT_EXPORT VideoCaptureHost
                      int buffer_id,
                      const scoped_refptr<media::VideoFrame>& frame) override;
   void OnEnded(VideoCaptureControllerID id) override;
+  void OnStarted(VideoCaptureControllerID id) override;
 
   // mojom::VideoCaptureHost implementation
   void Start(int32_t device_id,
@@ -76,6 +77,7 @@ class CONTENT_EXPORT VideoCaptureHost
 
   void DoError(VideoCaptureControllerID id);
   void DoEnded(VideoCaptureControllerID id);
+  void DoStarted(VideoCaptureControllerID id);
 
   // Bound as callback for VideoCaptureManager::StartCaptureForClient().
   void OnControllerAdded(