Use a FakeVideoTrackSource instead of nullptr in all VideoTrack tests.

webrtc/api/mediastream_unittest.cc

 /*
  *  Copyright 2011 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 <string>
 
 #include "webrtc/api/audiotrack.h"
 #include "webrtc/api/mediastream.h"
 #include "webrtc/api/videotrack.h"
+#include "webrtc/api/test/fakevideotracksource.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webrtc/base/gunit.h"
 #include "webrtc/base/refcount.h"
 #include "webrtc/base/scoped_ptr.h"
 
 static const char kStreamLabel1[] = "local_stream_1";
 static const char kVideoTrackId[] = "dummy_video_cam_1";
 static const char kAudioTrackId[] = "dummy_microphone_1";
 
@@ skipping 23 matching lines @@
  private:
   NotifierInterface* notifier_;
 };
 
 class MediaStreamTest: public testing::Test {
  protected:
   virtual void SetUp() {
     stream_ = MediaStream::Create(kStreamLabel1);
     ASSERT_TRUE(stream_.get() != NULL);
 
-    video_track_ = VideoTrack::Create(kVideoTrackId, NULL);
+    video_track_ =
+        VideoTrack::Create(kVideoTrackId, FakeVideoTrackSource::Create());
     ASSERT_TRUE(video_track_.get() != NULL);
     EXPECT_EQ(MediaStreamTrackInterface::kInitializing, video_track_->state());
 
     audio_track_ = AudioTrack::Create(kAudioTrackId, NULL);
 
     ASSERT_TRUE(audio_track_.get() != NULL);
     EXPECT_EQ(MediaStreamTrackInterface::kInitializing, audio_track_->state());
 
     EXPECT_TRUE(stream_->AddTrack(video_track_));
     EXPECT_FALSE(stream_->AddTrack(video_track_));
@@ skipping 79 matching lines @@
   ChangeTrack(video_track.get());
 }
 
 TEST_F(MediaStreamTest, ChangeAudioTrack) {
   scoped_refptr<webrtc::AudioTrackInterface> audio_track(
       stream_->GetAudioTracks()[0]);
   ChangeTrack(audio_track.get());
 }
 
 }  // namespace webrtc