Add video frame refresh to MediaStream and VideoCapture stacks.

content/renderer/media/video_capture_impl.h

 // Copyright (c) 2012 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_VIDEO_CAPTURE_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 55 matching lines @@
   // |state_update_cb| will be called when state changes.
   // |deliver_frame_cb| will be called when a frame is ready.
   void StartCapture(int client_id,
                     const media::VideoCaptureParams& params,
                     const VideoCaptureStateUpdateCB& state_update_cb,
                     const VideoCaptureDeliverFrameCB& deliver_frame_cb);
 
   // Stop capturing. |client_id| is the identifier used to call StartCapture.
   void StopCapture(int client_id);
 
+  // Requests that the video capturer send a frame "soon" (e.g., to resolve
+  // picture loss or quality issues).
+  void RequestRefreshFrame();
+
   // Get capturing formats supported by this device.
   // |callback| will be invoked with the results.
   void GetDeviceSupportedFormats(const VideoCaptureDeviceFormatsCB& callback);
 
   // Get capturing formats currently in use by this device.
   // |callback| will be invoked with the results.
   void GetDeviceFormatsInUse(const VideoCaptureDeviceFormatsCB& callback);
 
   media::VideoCaptureSessionId session_id() const { return session_id_; }
 
@@ skipping 113 matching lines @@
   // in |client_buffers_|.
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<VideoCaptureImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_H_