Automated IWYU fix for TaskRunner includes.

content/renderer/media/pepper_to_video_track_adapter.cc

 // Copyright (c) 2013 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/pepper_to_video_track_adapter.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/rand_util.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "content/renderer/media/media_stream.h"
 #include "content/renderer/media/media_stream_registry_interface.h"
 #include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/media/media_stream_video_track.h"
 #include "content/renderer/pepper/ppb_image_data_impl.h"
 #include "content/renderer/render_thread_impl.h"
 #include "media/base/video_frame_pool.h"
 #include "media/capture/video_capture_types.h"
@@ skipping 240 matching lines @@
 
   bool track_enabled = true;
   stream.AddTrack(MediaStreamVideoTrack::CreateVideoTrack(
       writer, MediaStreamVideoSource::ConstraintsCallback(), track_enabled));
 
   *frame_writer = new PpFrameWriterProxy(writer->AsWeakPtr());
   return true;
 }
 
 }  // namespace content