Add frame refresh to VideoCaptureDevice, and buffer pool resurrection.

content/browser/renderer_host/media/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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 42 matching lines @@
       const gfx::Size& dimensions,
       media::VideoPixelFormat format,
       media::VideoPixelStorage storage) override;
   void OnIncomingCapturedBuffer(scoped_ptr<Buffer> buffer,
                                 const media::VideoCaptureFormat& frame_format,
                                 const base::TimeTicks& timestamp) override;
   void OnIncomingCapturedVideoFrame(
       scoped_ptr<Buffer> buffer,
       const scoped_refptr<media::VideoFrame>& frame,
       const base::TimeTicks& timestamp) override;
+  scoped_ptr<Buffer> ResurrectLastOutputBuffer(
+      const gfx::Size& dimensions,
+      media::VideoPixelFormat format,
+      media::VideoPixelStorage storage) override;
   void OnError(const tracked_objects::Location& from_here,
                const std::string& reason) override;
   void OnLog(const std::string& message) override;
   double GetBufferPoolUtilization() const override;
 
  private:
   // Reserve output buffer into which I420 contents can be copied directly.
   // The dimensions of the frame is described by |dimensions|, and requested
   // output buffer format is specified by |storage|. The reserved output buffer
   // is returned; and the pointer to Y plane is stored at [y_plane_data], U
@@ skipping 29 matching lines @@
 
   media::VideoPixelFormat last_captured_pixel_format_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceClient);
 };
 
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_DEVICE_CLIENT_H_