Request frame for new sinks from MediaStreamVideoTrack

content/renderer/media/canvas_capture_handler.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 CONTENT_RENDERER_MEDIA_CANVAS_CAPTURE_HANDLER_H_
 #define CONTENT_RENDERER_MEDIA_CANVAS_CAPTURE_HANDLER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 35 matching lines @@
   // blink::WebCanvasCaptureHandler Implementation.
   void sendNewFrame(const SkImage* image) override;
   bool needsNewFrame() const override;
 
   // Functions called by media::VideoCapturerSource implementation.
   void StartVideoCapture(
       const media::VideoCaptureParams& params,
       const media::VideoCapturerSource::VideoCaptureDeliverFrameCB&
           new_frame_callback,
       const media::VideoCapturerSource::RunningCallback& running_callback);
+  void RequestLastFrame();
   void StopVideoCapture();
   blink::WebSize GetSourceSize() const { return size_; }
 
  private:
   // A VideoCapturerSource instance is created, which is responsible for handing
   // stop&start callbacks back to CanvasCaptureHandler. That VideoCapturerSource
   // is then plugged into a MediaStreamTrack passed as |track|, and it is owned
   // by the Blink side MediaStreamSource.
   CanvasCaptureHandler(
       const blink::WebSize& size,
@@ skipping 13 matching lines @@
   media::VideoCaptureFormat capture_format_;
   bool ask_for_new_frame_;
 
   const blink::WebSize size_;
   gfx::Size last_size;
   std::vector<uint8_t> temp_data_;
   size_t row_bytes_;
   SkImageInfo image_info_;
   media::VideoFramePool frame_pool_;
 
+  scoped_refptr<media::VideoFrame> last_frame_;
+  base::TimeTicks last_frame_estimated_capture_time_;
+
   const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
   scoped_ptr<CanvasCaptureHandlerDelegate> delegate_;
 
   // Bound to Main Render thread.
   base::ThreadChecker main_render_thread_checker_;
   base::WeakPtrFactory<CanvasCaptureHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CanvasCaptureHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_CANVAS_CAPTURE_HANDLER_H_