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

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

 /*
  * Copyright (C) 2012, 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 131 matching lines @@
     finish();
   }
 
   return;
 }
 
 void AudioScheduledSourceHandler::start(double when,
                                         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(
         InvalidAccessError,
@@ skipping 110 matching lines @@
   // playback state if the context is closed.
   if (context()->isContextClosed())
     return false;
 
   // If a node is scheduled or playing, do not collect the node prematurely
   // even its reference is out of scope. Then fire onended event if assigned.
   return audioScheduledSourceHandler().isPlayingOrScheduled();
 }
 
 }  // namespace blink