Add video frame refresh to MediaStream and VideoCapture stacks.

content/renderer/media/video_capture_impl.cc

 // 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.
 //
 // Notes about usage of this object by VideoCaptureImplManager.
 //
 // VideoCaptureImplManager access this object by using a Unretained()
 // binding and tasks on the IO thread. It is then important that
 // VideoCaptureImpl never post task to itself. All operations must be
 // synchronous.
@@ skipping 199 matching lines @@
 
   if (clients_.empty()) {
     DVLOG(1) << "StopCapture: No more client, stopping ...";
     StopDevice();
     client_buffers_.clear();
     client_buffer2s_.clear();
     weak_factory_.InvalidateWeakPtrs();
   }
 }
 
+void VideoCaptureImpl::RequestRefreshFrame() {
+  DCHECK(io_task_runner_->BelongsToCurrentThread());
+  Send(new VideoCaptureHostMsg_RequestRefreshFrame(device_id_));
+}
+
 void VideoCaptureImpl::GetDeviceSupportedFormats(
     const VideoCaptureDeviceFormatsCB& callback) {
   DCHECK(io_task_runner_->BelongsToCurrentThread());
   device_formats_cb_queue_.push_back(callback);
   if (device_formats_cb_queue_.size() == 1)
     Send(new VideoCaptureHostMsg_GetDeviceSupportedFormats(device_id_,
                                                            session_id_));
 }
 
 void VideoCaptureImpl::GetDeviceFormatsInUse(
@@ skipping 322 matching lines @@
   double consumer_resource_utilization = -1.0;
   if (!metadata->GetDouble(media::VideoFrameMetadata::RESOURCE_UTILIZATION,
                            &consumer_resource_utilization)) {
     consumer_resource_utilization = -1.0;
   }
 
   callback_to_io_thread.Run(*release_sync_token, consumer_resource_utilization);
 }
 
 }  // namespace content