getUserMeida: report device starting states

media/capture/content/thread_safe_capture_oracle.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 MEDIA_CAPTURE_CONTENT_THREAD_SAFE_CAPTURE_ORACLE_H_
 #define MEDIA_CAPTURE_CONTENT_THREAD_SAFE_CAPTURE_ORACLE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 73 matching lines @@
   // maximum frame size.
   void UpdateCaptureSize(const gfx::Size& source_size);
 
   // Stop new captures from happening (but doesn't forget the client).
   void Stop();
 
   // Signal an error to the client.
   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:
   friend class base::RefCountedThreadSafe<ThreadSafeCaptureOracle>;
   virtual ~ThreadSafeCaptureOracle();
 
   // Callback invoked on completion of all captures.
   void DidCaptureFrame(int frame_number,
                        VideoCaptureDevice::Client::Buffer buffer,
                        base::TimeTicks capture_begin_time,
@@ skipping 16 matching lines @@
   // Makes the decision to capture a frame.
   VideoCaptureOracle oracle_;
 
   // The video capture parameters used to construct the oracle proxy.
   const VideoCaptureParams params_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CAPTURE_CONTENT_THREAD_SAFE_CAPTURE_ORACLE_H_