Release the camera when WebRTC is not visible in Android

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 55 matching lines @@
 
 void VideoCaptureImpl::DeInit() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (state_ == VIDEO_CAPTURE_STATE_STARTED)
     Send(new VideoCaptureHostMsg_Stop(device_id_));
   message_filter_->RemoveDelegate(this);
 }
 
 void VideoCaptureImpl::SuspendCapture(bool suspend) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  suspended_ = suspend;
+  Send(suspend ?
+       static_cast<IPC::Message*>(new VideoCaptureHostMsg_Pause(device_id_)) :
+       static_cast<IPC::Message*>(
+           new VideoCaptureHostMsg_Resume(device_id_, session_id_, params_)));
 }
 
 void VideoCaptureImpl::StartCapture(
     int client_id,
     const media::VideoCaptureParams& params,
     const VideoCaptureStateUpdateCB& state_update_cb,
     const VideoCaptureDeliverFrameCB& deliver_frame_cb) {
   DCHECK(thread_checker_.CalledOnValidThread());
   ClientInfo client_info;
   client_info.params = params;
@@ skipping 347 matching lines @@
   ClientInfoMap::iterator it = clients->find(client_id);
   if (it != clients->end()) {
     it->second.state_update_cb.Run(VIDEO_CAPTURE_STATE_STOPPED);
     clients->erase(it);
     found = true;
   }
   return found;
 }
 
 }  // namespace content