Add missing macros includes in media/.

media/cast/test/utility/audio_utility.h

 // Copyright 2014 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 MEDIA_CAST_TEST_UTILITY_AUDIO_UTILITY_H_
 #define MEDIA_CAST_TEST_UTILITY_AUDIO_UTILITY_H_
 
+#include "base/macros.h"
 #include "media/audio/simple_sources.h"
 
 namespace base {
 class TimeDelta;
 }
 
 namespace media {
 class AudioBus;
 }
 
@@ skipping 55 matching lines @@
                      float* samples);
 
 // Decode a timestamp encoded with EncodeTimestamp. Returns true if a
 // timestamp was found in |samples|.
 bool DecodeTimestamp(const float* samples, size_t length, uint16_t* timestamp);
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_TEST_UTILITY_AUDIO_UTILITY_H_