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

third_party/WebKit/Source/core/dom/MessagePort.h

Index: third_party/WebKit/Source/core/dom/MessagePort.h
diff --git a/third_party/WebKit/Source/core/dom/MessagePort.h b/third_party/WebKit/Source/core/dom/MessagePort.h
index e59003fc37c94951b37c3c4db859f3152868f90d..cd0d1c5a16ee76c4266f54ad475d47a5b3fee7c8 100644
--- a/third_party/WebKit/Source/core/dom/MessagePort.h
+++ b/third_party/WebKit/Source/core/dom/MessagePort.h
@@ -27,6 +27,7 @@
 #ifndef MessagePort_h
 #define MessagePort_h
 
+#include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/events/EventListener.h"
@@ -57,6 +58,7 @@ typedef Vector<OwnPtr<WebMessagePortChannel>, 1> MessagePortChannelArray;
 
 class CORE_EXPORT MessagePort
     : public RefCountedGarbageCollectedEventTargetWithInlineData<MessagePort>
+    , public ActiveScriptWrappable
     , public ActiveDOMObject
     , public WebMessagePortChannelClient {
     DEFINE_WRAPPERTYPEINFO();
@@ -89,8 +91,10 @@ public:
     ExecutionContext* getExecutionContext() const override { return ActiveDOMObject::getExecutionContext(); }
     MessagePort* toMessagePort() override { return this; }
 
+    // ActiveScriptWrappable implementation.
+    bool hasPendingActivity() const final;
+
     // ActiveDOMObject implementation.
-    bool hasPendingActivity() const override;
     void stop() override { close(); }
 
     void setOnmessage(PassRefPtrWillBeRawPtr<EventListener> listener)