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

third_party/WebKit/Source/modules/mediasource/SourceBuffer.idl

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 // https://www.w3.org/TR/media-source/#idl-def-SourceBuffer
 
 enum AppendMode {
     "segments",
     "sequence"
 };
 
 [
+    ActiveScriptWrappable,
     DependentLifetime,
 ] interface SourceBuffer : EventTarget {
 
     // Gets or sets the AppendMode.
     [RaisesException=Setter] attribute AppendMode mode;
 
     readonly attribute boolean updating;
 
     // Returns the time ranges buffered.
     [RaisesException=Getter] readonly attribute TimeRanges buffered;
@@ skipping 14 matching lines @@
     [RaisesException, RuntimeEnabled=ExperimentalStream] void appendStream(Stream stream, optional unsigned long long maxSize);
 
     // Abort the current segment append sequence.
     [RaisesException] void abort();
     [RaisesException] void remove(double start, unrestricted double end);
 
     // Gets or sets the TrackDefaultList this SourceBuffer may consult during
     // the initialization segment algorithm.
     [RaisesException=Setter, RuntimeEnabled=MediaSourceExperimental] attribute TrackDefaultList trackDefaults;
 };