VRDisplay inherits from EventTarget

third_party/WebKit/Source/modules/vr/VRDisplay.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef VRDisplay_h
 #define VRDisplay_h
 
-#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/dom/ActiveDOMObject.h"
 #include "core/dom/Document.h"
 #include "core/dom/FrameRequestCallback.h"
+#include "core/events/EventTarget.h"
 #include "device/vr/vr_service.mojom-blink.h"
 #include "modules/vr/VRDisplayCapabilities.h"
 #include "modules/vr/VRLayer.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebGraphicsContext3DProvider.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 
@@ skipping 10 matching lines @@
 class VRController;
 class VREyeParameters;
 class VRFrameData;
 class VRStageParameters;
 class VRPose;
 
 class WebGLRenderingContextBase;
 
 enum VREye { VREyeNone, VREyeLeft, VREyeRight };
 
-class VRDisplay final : public GarbageCollectedFinalized<VRDisplay>,
-                        public device::mojom::blink::VRDisplayClient,
-                        public ScriptWrappable {
+class VRDisplay final : public EventTargetWithInlineData,
+                        public ActiveScriptWrappable,
+                        public ActiveDOMObject,
+                        public device::mojom::blink::VRDisplayClient {
   DEFINE_WRAPPERTYPEINFO();
+  USING_GARBAGE_COLLECTED_MIXIN(VRDisplay);
   USING_PRE_FINALIZER(VRDisplay, dispose);
 
  public:
   ~VRDisplay();
 
   unsigned displayId() const { return m_displayId; }
   const String& displayName() const { return m_displayName; }
 
   VRDisplayCapabilities* capabilities() const { return m_capabilities; }
   VRStageParameters* stageParameters() const { return m_stageParameters; }
@@ skipping 17 matching lines @@
   void cancelAnimationFrame(int id);
   void serviceScriptedAnimations(double monotonicAnimationStartTime);
 
   ScriptPromise requestPresent(ScriptState*, const HeapVector<VRLayer>& layers);
   ScriptPromise exitPresent(ScriptState*);
 
   HeapVector<VRLayer> getLayers();
 
   void submitFrame();
 
+  // EventTarget overrides:
+  ExecutionContext* getExecutionContext() const override;
+  const AtomicString& interfaceName() const override;
+
+  // ActiveDOMObject implementation.
+  void suspend() override;
+  void resume() override;

[haraken, 2016/11/29 01:43:28]

Do you really want to implement suspend/resume? Otherwise, you can use
ContextLifecycleObserver.

+  void contextDestroyed() override;
+
+  // ScriptWrappable implementation.
+  bool hasPendingActivity() const final;
+
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   friend class VRController;
 
   VRDisplay(NavigatorVR*,
             device::mojom::blink::VRDisplayPtr,
             device::mojom::blink::VRDisplayClientRequest);
 
   void update(const device::mojom::blink::VRDisplayInfoPtr&);
@@ skipping 77 matching lines @@
   ServiceInactive = 11,
   RequestDenied = 12,
   PresentationResultMax,  // Must be last member of enum.
 };
 
 void ReportPresentationResult(PresentationResult);
 
 }  // namespace blink
 
 #endif  // VRDisplay_h