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

third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.h

Index: third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.h
diff --git a/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.h b/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.h
index 61e5e92143e36ae9fc2b535495e91239f5bbe83a..77786c646798bf2de7212e6ac0b7625354e44d64 100644
--- a/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.h
+++ b/third_party/WebKit/Source/modules/encryptedmedia/MediaKeySession.h
@@ -26,6 +26,7 @@
 #ifndef MediaKeySession_h
 #define MediaKeySession_h
 
+#include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptPromiseProperty.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/DOMArrayPiece.h"
@@ -60,6 +61,7 @@ class MediaKeys;
 // The WebContentDecryptionModuleSession has the same lifetime as this object.
 class MediaKeySession final
     : public RefCountedGarbageCollectedEventTargetWithInlineData<MediaKeySession>
+    , public ActiveScriptWrappable
     , public ActiveDOMObject
     , private WebContentDecryptionModuleSession::Client {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(MediaKeySession);
@@ -85,8 +87,10 @@ public:
     const AtomicString& interfaceName() const override;
     ExecutionContext* getExecutionContext() const override;
 
+    // ActiveScriptWrappable
+    bool hasPendingActivity() const final;
+
     // ActiveDOMObject
-    bool hasPendingActivity() const override;
     void stop() override;
 
     // Oilpan: eagerly release owned m_session, which in turn