Revert of Delete empty API files and cleaned up includes.

webrtc/api/test/peerconnectiontestwrapper.cc

 /*
  *  Copyright 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include <utility>
 
 #include "webrtc/api/test/fakedtlsidentitystore.h"
 #include "webrtc/api/test/fakeperiodicvideocapturer.h"
 #include "webrtc/api/test/mockpeerconnectionobservers.h"
 #include "webrtc/api/test/peerconnectiontestwrapper.h"
+#include "webrtc/api/videosourceinterface.h"
 #include "webrtc/base/gunit.h"
 #include "webrtc/p2p/client/fakeportallocator.h"
 
 static const char kStreamLabelBase[] = "stream_label";
 static const char kVideoTrackLabelBase[] = "video_track";
 static const char kAudioTrackLabelBase[] = "audio_track";
 static const int kMaxWait = 10000;
 static const int kTestAudioFrameCount = 3;
 static const int kTestVideoFrameCount = 3;
 
@@ skipping 243 matching lines @@
         peer_connection_factory_->CreateVideoSource(
             new webrtc::FakePeriodicVideoCapturer(), &constraints);
     std::string videotrack_label = label + kVideoTrackLabelBase;
     rtc::scoped_refptr<webrtc::VideoTrackInterface> video_track(
         peer_connection_factory_->CreateVideoTrack(videotrack_label, source));
 
     stream->AddTrack(video_track);
   }
   return stream;
 }