Web Audio: record autoplay status when an AudioContext is destroyed.

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

 /*
  * 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 481 matching lines @@
   startSource(when, grainOffset, grainDuration, true, exceptionState);
 }
 
 void AudioBufferSourceHandler::startSource(double when,
                                            double grainOffset,
                                            double grainDuration,
                                            bool isDurationGiven,
                                            ExceptionState& exceptionState) {
   DCHECK(isMainThread());
 
-  // TODO(mlamouri): record when this is called with a user gesture and could
-  // have started the AudioContext if following Safari iOS rules.
+  context()->maybeRecordStartAttempt();
 
   if (playbackState() != UNSCHEDULED_STATE) {
     exceptionState.throwDOMException(InvalidStateError,
                                      "cannot call start more than once.");
     return;
   }
 
   if (when < 0) {
     exceptionState.throwDOMException(
         InvalidStateError,
@@ skipping 241 matching lines @@
 
 void AudioBufferSourceNode::start(double when,
                                   double grainOffset,
                                   double grainDuration,
                                   ExceptionState& exceptionState) {
   audioBufferSourceHandler().start(when, grainOffset, grainDuration,
                                    exceptionState);
 }
 
 }  // namespace blink