Add video frame refresh to MediaStream and VideoCapture stacks.

content/renderer/media/video_capture_impl_manager.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.
 //
 // Implementation notes about interactions with VideoCaptureImpl.
 //
 // How is VideoCaptureImpl used:
 //
 // VideoCaptureImpl is an IO thread object while VideoCaptureImplManager
 // lives only on the render thread. It is only possible to access an
@@ skipping 78 matching lines @@
   const int client_id = ++next_client_id_;
 
   ChildProcess::current()->io_task_runner()->PostTask(
       FROM_HERE,
       base::Bind(&VideoCaptureImpl::StartCapture, base::Unretained(impl),
                  client_id, params, state_update_cb, deliver_frame_cb));
   return base::Bind(&VideoCaptureImplManager::StopCapture,
                     weak_factory_.GetWeakPtr(), client_id, id);
 }
 
+void VideoCaptureImplManager::RequestRefreshFrame(
+    media::VideoCaptureSessionId id) {
+  DCHECK(render_main_task_runner_->BelongsToCurrentThread());
+  const VideoCaptureDeviceMap::const_iterator it = devices_.find(id);
+  DCHECK(it != devices_.end());
+  VideoCaptureImpl* const impl = it->second.second;
+  ChildProcess::current()->io_task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&VideoCaptureImpl::RequestRefreshFrame,
+                 base::Unretained(impl)));
+}
+
+
 void VideoCaptureImplManager::GetDeviceSupportedFormats(
     media::VideoCaptureSessionId id,
     const VideoCaptureDeviceFormatsCB& callback) {
   DCHECK(render_main_task_runner_->BelongsToCurrentThread());
   const VideoCaptureDeviceMap::const_iterator it = devices_.find(id);
   DCHECK(it != devices_.end());
   VideoCaptureImpl* const impl = it->second.second;
   ChildProcess::current()->io_task_runner()->PostTask(
       FROM_HERE, base::Bind(&VideoCaptureImpl::GetDeviceSupportedFormats,
                             base::Unretained(impl), callback));
@@ skipping 52 matching lines @@
   DCHECK(render_main_task_runner_->BelongsToCurrentThread());
   for (const auto& device : devices_) {
     VideoCaptureImpl* const impl = device.second.second;
     ChildProcess::current()->io_task_runner()->PostTask(
         FROM_HERE, base::Bind(&VideoCaptureImpl::SuspendCapture,
                               base::Unretained(impl), suspend));
   }
 }
 
 }  // namespace content