[v8 gc] Introduce a base class for all objects that can have pending activity

third_party/WebKit/Source/modules/webaudio/ScriptProcessorNode.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 220 matching lines @@
         exceptionState.throwDOMException(
             NotSupportedError,
             "channelCountMode cannot be changed from 'explicit' to '" + mode + "'");
     }
 }
 
 // ----------------------------------------------------------------
 
 ScriptProcessorNode::ScriptProcessorNode(AbstractAudioContext& context, float sampleRate, size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels)
     : AudioNode(context)
+    , ActiveScriptWrappable(this)
 {
     setHandler(ScriptProcessorHandler::create(*this, sampleRate, bufferSize, numberOfInputChannels, numberOfOutputChannels));
 }
 
 static size_t chooseBufferSize()
 {
     // Choose a buffer size based on the audio hardware buffer size. Arbitarily make it a power of
     // two that is 4 times greater than the hardware buffer size.
     // FIXME: What is the best way to choose this?
     size_t hardwareBufferSize = Platform::current()->audioHardwareBufferSize();
@@ skipping 52 matching lines @@
     // If |onaudioprocess| event handler is defined, the node should not be
     // GCed even if it is out of scope.
     if (hasEventListeners(EventTypeNames::audioprocess))
         return true;
 
     return false;
 }
 
 } // namespace blink