Automated IWYU fix for TaskRunner includes.

extensions/renderer/api/display_source/wifi_display/wifi_display_video_encoder.h

 // Copyright 2016 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.
 
 #ifndef EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_VIDEO_ENCODER_H_
 #define EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_VIDEO_ENCODER_H_
 
 #include <vector>
 
 #include "base/memory/shared_memory.h"
+#include "base/single_thread_task_runner.h"
 #include "extensions/renderer/api/display_source/wifi_display/wifi_display_media_encoder.h"
 #include "media/base/video_frame.h"
 #include "media/video/video_encode_accelerator.h"
 #include "third_party/wds/src/libwds/public/video_format.h"
 
 namespace extensions {
 
 class WiFiDisplayElementaryStreamDescriptor;
 
 using WiFiDisplayEncodedFrame = WiFiDisplayEncodedUnit;
@@ skipping 81 matching lines @@
       bool send_idr) = 0;
 
   std::vector<WiFiDisplayElementaryStreamDescriptor> descriptors_;
   scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
   bool send_idr_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_VIDEO_ENCODER_H_