Begin adding support for tab mirroring via the MediaStream audio/video capturing

content/renderer/media/mock_media_stream_dispatcher.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.
 
 #include "content/renderer/media/mock_media_stream_dispatcher.h"
 
 #include "base/stringprintf.h"
 
 MockMediaStreamDispatcher::MockMediaStreamDispatcher()
     : MediaStreamDispatcher(NULL),
       request_id_(-1),
       stop_stream_counter_(0) {
 }
 
 MockMediaStreamDispatcher::~MockMediaStreamDispatcher() {}
 
 void MockMediaStreamDispatcher::GenerateStream(
     int request_id,
     const base::WeakPtr<MediaStreamDispatcherEventHandler>&,
     media_stream::StreamOptions components,
     const GURL&) {
   request_id_ = request_id;
 
   stream_label_ = StringPrintf("%s%d","local_stream",request_id);
   audio_array_.clear();
   video_array_.clear();
 
-  if (components.audio) {
+  if (content::IsAudioMediaStreamDeviceType(components.audio_type)) {
     media_stream::StreamDeviceInfo audio;
-    audio.device_id= "audio_device_id";
-    audio.name ="audio microphone";
-    audio.stream_type = content::MEDIA_STREAM_DEVICE_TYPE_AUDIO_CAPTURE;
+    audio.device_id = "audio_device_id";
+    audio.name = "audio microphone";
+    audio.stream_type = components.audio_type;
     audio.session_id = request_id;
     audio_array_.push_back(audio);
   }
-  if (components.video) {
+  if (content::IsVideoMediaStreamDeviceType(components.video_type)) {
     media_stream::StreamDeviceInfo video;
-    video.device_id= "video_device_id";
-    video.name ="usb video camera";
-    video.stream_type = content::MEDIA_STREAM_DEVICE_TYPE_VIDEO_CAPTURE;
+    video.device_id = "video_device_id";
+    video.name = "usb video camera";
+    video.stream_type = components.video_type;
     video.session_id = request_id;
     video_array_.push_back(video);
   }
 }
 
 void MockMediaStreamDispatcher::StopStream(const std::string& label) {
   ++stop_stream_counter_;
 }
 
 bool MockMediaStreamDispatcher::IsStream(const std::string& label) {
   return true;
 }
 
 int MockMediaStreamDispatcher::video_session_id(const std::string& label,
                                                 int index) {
   return -1;
 }
 
 int MockMediaStreamDispatcher::audio_session_id(const std::string& label,
                                                 int index) {
   return -1;
 }