Cast: deliver video frames on the IO thread

content/renderer/media/webrtc/webrtc_media_stream_adapter_unittest.cc

 // Copyright 2014 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 "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
 #include "content/child/child_process.h"
 #include "content/renderer/media/media_stream.h"
 #include "content/renderer/media/media_stream_audio_source.h"
 #include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/media/media_stream_video_track.h"
 #include "content/renderer/media/mock_media_stream_dependency_factory.h"
 #include "content/renderer/media/mock_media_stream_video_source.h"
 #include "content/renderer/media/webrtc/webrtc_local_audio_track_adapter.h"
 #include "content/renderer/media/webrtc/webrtc_media_stream_adapter.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 68 matching lines @@
               adapter_->webrtc_media_stream()->GetVideoTracks().size());
     EXPECT_EQ(blink_stream.id().utf8(),
               adapter_->webrtc_media_stream()->label());
   }
 
   webrtc::MediaStreamInterface* webrtc_stream() {
     return adapter_->webrtc_media_stream();
   }
 
  protected:
+  base::MessageLoop message_loop_;
   scoped_ptr<ChildProcess> child_process_;
   scoped_ptr<MockMediaStreamDependencyFactory> dependency_factory_;
   scoped_ptr<WebRtcMediaStreamAdapter> adapter_;
 };
 
 TEST_F(WebRtcMediaStreamAdapterTest, CreateWebRtcMediaStream) {
   blink::WebMediaStream blink_stream = CreateBlinkMediaStream(true, true);
   CreateWebRtcMediaStream(blink_stream, 1, 1);
 }
 
@@ skipping 40 matching lines @@
   EXPECT_TRUE(webrtc_stream()->GetVideoTracks().empty());
 
   native_stream->AddTrack(audio_tracks[0]);
   EXPECT_EQ(1u, webrtc_stream()->GetAudioTracks().size());
 
   native_stream->AddTrack(video_tracks[0]);
   EXPECT_EQ(1u, webrtc_stream()->GetVideoTracks().size());
 }
 
 }  // namespace content