Automated IWYU fix for TaskRunner includes.

media/audio/audio_debug_recording_helper_unittest.cc

 // Copyright 2017 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 "media/audio/audio_debug_recording_helper.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/test/test_message_loop.h"
 #include "media/base/audio_bus.h"
 #include "media/base/audio_sample_types.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using testing::_;
 using testing::Return;
 
@@ skipping 227 matching lines @@
 
   EXPECT_CALL(*mock_audio_file_writer, Stop());
   DisableDebugRecording(recording_helper.get());
 
   // This call should not yield a DoWrite() call on the mock either.
   recording_helper->OnData(audio_bus.get());
   base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace media