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

third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h

Index: third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h
diff --git a/third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h b/third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h
index ee3a493f71292382bff2216427cb75e92b259eeb..67a557c6974c2fc5822e5c6c1cd31ce6e0ac93c5 100644
--- a/third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h
+++ b/third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h
@@ -27,6 +27,7 @@
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "bindings/core/v8/V8GCRoot.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/DOMTypedArray.h"
 #include "core/events/EventListener.h"
@@ -81,7 +82,7 @@ class WaveShaperNode;
 // AbstractAudioContext 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 AbstractAudioContext : public RefCountedGarbageCollectedEventTargetWithInlineData<AbstractAudioContext>, public ActiveDOMObject {
+class MODULES_EXPORT AbstractAudioContext : public RefCountedGarbageCollectedEventTargetWithInlineData<AbstractAudioContext>, public ActiveDOMObject, public V8GCRoot {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(AbstractAudioContext);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AbstractAudioContext);
     DEFINE_WRAPPERTYPEINFO();