Make AudioBufferSourceNode.buffer setter conforming

third_party/WebKit/Source/modules/webaudio/AudioBufferSourceNode.h

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 162 matching lines @@
   // The minimum playbackRate value ever used for this source.
   double min_playback_rate_;
 
   // |min_playback_rate_| may be updated by the audio thread
   // while the main thread checks if the node is in a stoppable
   // state, hence access needs to be atomic.
   //
   // TODO: when the codebase adopts std::atomic<>, use it for
   // |min_playback_rate_|.
   Mutex min_playback_rate_mutex_;
+
+  // True if the |buffer| attribute has ever been set to a non-null
+  // value.  Defaults to false.
+  bool buffer_has_been_set_;

[hongchan, 2017/07/28 18:45:32]

Add ` = false;` and remove the comment about the default value.

[Raymond Toy, 2017/07/28 19:16:55]

The constructor needs to initialize other things, so I find it very convenient
to initialize everything there, even if we could initialize it somewhere else. 
One less file to look at.

 };
 
 class AudioBufferSourceNode final : public AudioScheduledSourceNode {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static AudioBufferSourceNode* Create(BaseAudioContext&, ExceptionState&);
   static AudioBufferSourceNode* Create(BaseAudioContext*,
                                        AudioBufferSourceOptions&,
                                        ExceptionState&);
@@ skipping 22 matching lines @@
  private:
   AudioBufferSourceNode(BaseAudioContext&);
 
   Member<AudioParam> playback_rate_;
   Member<AudioParam> detune_;
 };
 
 }  // namespace blink
 
 #endif  // AudioBufferSourceNode_h