ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/modules/webaudio/BaseAudioContext.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 67 matching lines @@
 class ScriptPromiseResolver;
 class ScriptState;
 class SecurityOrigin;
 class StereoPannerNode;
 class WaveShaperNode;
 
 // BaseAudioContext is the cornerstone of the web audio API and all AudioNodes
 // are created from it.  For thread safety between the audio thread and the main
 // thread, it has a rendering graph locking mechanism.
 
-class MODULES_EXPORT BaseAudioContext : public EventTargetWithInlineData,
-                                        public ActiveScriptWrappable,
-                                        public SuspendableObject {
+class MODULES_EXPORT BaseAudioContext
+    : public EventTargetWithInlineData,
+      public ActiveScriptWrappable<BaseAudioContext>,
+      public SuspendableObject {
   USING_GARBAGE_COLLECTED_MIXIN(BaseAudioContext);
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   // The state of an audio context.  On creation, the state is Suspended. The
   // state is Running if audio is being processed (audio graph is being pulled
   // for data). The state is Closed if the audio context has been closed.  The
   // valid transitions are from Suspended to either Running or Closed; Running
   // to Suspended or Closed. Once Closed, there are no valid transitions.
   enum AudioContextState { Suspended, Running, Closed };
@@ skipping 346 matching lines @@
   // This is considering 32 is large enough for multiple channels audio.
   // It is somewhat arbitrary and could be increased if necessary.
   enum { MaxNumberOfChannels = 32 };
 
   Optional<AutoplayStatus> m_autoplayStatus;
 };
 
 }  // namespace blink
 
 #endif  // BaseAudioContext_h