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

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

 /*
  * Copyright (C) 2013 Apple 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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  */
 
 #ifndef MediaKeys_h
 #define MediaKeys_h
 
+#include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/DOMArrayPiece.h"
 #include "platform/Timer.h"
 #include "public/platform/WebContentDecryptionModule.h"
 #include "public/platform/WebEncryptedMediaTypes.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebVector.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ExceptionState;
 class ExecutionContext;
 class HTMLMediaElement;
 class MediaKeySession;
 class ScriptState;
 class WebContentDecryptionModule;
 
 // References are held by JS and HTMLMediaElement.
 // The WebContentDecryptionModule has the same lifetime as this object.
-class MediaKeys : public GarbageCollectedFinalized<MediaKeys>, public ActiveDOMObject, public ScriptWrappable {
+class MediaKeys : public GarbageCollectedFinalized<MediaKeys>, public ActiveScriptWrappable, public ActiveDOMObject, public ScriptWrappable {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaKeys);
     DEFINE_WRAPPERTYPEINFO();
 public:
     static MediaKeys* create(ExecutionContext*, const WebVector<WebEncryptedMediaSessionType>& supportedSessionTypes, PassOwnPtr<WebContentDecryptionModule>);
     ~MediaKeys() override;
 
     MediaKeySession* createSession(ScriptState*, const String& sessionTypeString, ExceptionState&);
 
     ScriptPromise setServerCertificate(ScriptState*, const DOMArrayPiece& serverCertificate);
 
@@ skipping 12 matching lines @@
     // The previously reserved and accepted HTMLMediaElement is no longer
     // using this object.
     void clearMediaElement();
 
     WebContentDecryptionModule* contentDecryptionModule();
 
     DECLARE_VIRTUAL_TRACE();
 
     // ActiveDOMObject implementation.
     // FIXME: This class could derive from ContextLifecycleObserver
-    // again once hasPendingActivity() is moved to ScriptWrappable
-    // (http://crbug.com/483722).
+    // again (http://crbug.com/483722).
     void contextDestroyed() override;
-    bool hasPendingActivity() const override;
     void stop() override;
 
+    // ActiveScriptWrappable implementation.
+    bool hasPendingActivity() const final;
+
 private:
     MediaKeys(ExecutionContext*, const WebVector<WebEncryptedMediaSessionType>& supportedSessionTypes, PassOwnPtr<WebContentDecryptionModule>);
     class PendingAction;
 
     bool sessionTypeSupported(WebEncryptedMediaSessionType);
     void timerFired(Timer<MediaKeys>*);
 
     const WebVector<WebEncryptedMediaSessionType> m_supportedSessionTypes;
     OwnPtr<WebContentDecryptionModule> m_cdm;
 
@@ skipping 11 matching lines @@
     // object will be prevented until the setMediaKeys() completes.
     bool m_reservedForMediaElement;
 
     HeapDeque<Member<PendingAction>> m_pendingActions;
     Timer<MediaKeys> m_timer;
 };
 
 } // namespace blink
 
 #endif // MediaKeys_h