ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/modules/webaudio/ScriptProcessorNode.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 89 matching lines @@
   unsigned m_numberOfInputChannels;
   unsigned m_numberOfOutputChannels;
 
   RefPtr<AudioBus> m_internalInputBus;
   // Synchronize process() with fireProcessEvent().
   mutable Mutex m_processEventLock;
 
   FRIEND_TEST_ALL_PREFIXES(ScriptProcessorNodeTest, BufferLifetime);
 };
 
-class ScriptProcessorNode final : public AudioNode,
-                                  public ActiveScriptWrappable {
+class ScriptProcessorNode final
+    : public AudioNode,
+      public ActiveScriptWrappable<ScriptProcessorNode> {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(ScriptProcessorNode);
 
  public:
   // bufferSize must be one of the following values: 256, 512, 1024, 2048,
   // 4096, 8192, 16384.
   // This value controls how frequently the onaudioprocess event handler is
   // called and how many sample-frames need to be processed each call.
   // Lower numbers for bufferSize will result in a lower (better)
   // latency. Higher numbers will be necessary to avoid audio breakup and
@@ skipping 25 matching lines @@
   ScriptProcessorNode(BaseAudioContext&,
                       float sampleRate,
                       size_t bufferSize,
                       unsigned numberOfInputChannels,
                       unsigned numberOfOutputChannels);
 };
 
 }  // namespace blink
 
 #endif  // ScriptProcessorNode_h