getUserMeida: report device starting states

media/capture/content/thread_safe_capture_oracle.h

Index: media/capture/content/thread_safe_capture_oracle.h
diff --git a/media/capture/content/thread_safe_capture_oracle.h b/media/capture/content/thread_safe_capture_oracle.h
index 7b970c359d579332b472008253f3a0ceb7f29258..c107a19c74ca5a8b28b97a4a631752f0a8fbaedb 100644
--- a/media/capture/content/thread_safe_capture_oracle.h
+++ b/media/capture/content/thread_safe_capture_oracle.h
@@ -91,6 +91,9 @@ class CAPTURE_EXPORT ThreadSafeCaptureOracle
   void ReportError(const tracked_objects::Location& from_here,
                    const std::string& reason);
 
+  // Signal device started to the client.
+  void ReportStarted();
+
   void OnConsumerReportingUtilization(int frame_number, double utilization);
 
  private:
@@ -122,6 +125,9 @@ class CAPTURE_EXPORT ThreadSafeCaptureOracle
 
   // The video capture parameters used to construct the oracle proxy.
   const VideoCaptureParams params_;
+
+  // OnStarted() event has been reported.
+  bool capture_;
 };
 
 }  // namespace media