VRDisplay inherits from EventTarget

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

Index: third_party/WebKit/Source/modules/vr/VRDisplay.h
diff --git a/third_party/WebKit/Source/modules/vr/VRDisplay.h b/third_party/WebKit/Source/modules/vr/VRDisplay.h
index 7daad3ced56268b92c0d5111deec5976587d4639..718717312ea0253b7f214683bf86c86559103473 100644
--- a/third_party/WebKit/Source/modules/vr/VRDisplay.h
+++ b/third_party/WebKit/Source/modules/vr/VRDisplay.h
@@ -5,9 +5,10 @@
 #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"
@@ -38,10 +39,12 @@ 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:
@@ -79,6 +82,18 @@ class VRDisplay final : public GarbageCollectedFinalized<VRDisplay>,
 
   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: