Add support of vrdisplayconnect and vrdisplaydisconnect event

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

Index: third_party/WebKit/Source/modules/vr/NavigatorVR.h
diff --git a/third_party/WebKit/Source/modules/vr/NavigatorVR.h b/third_party/WebKit/Source/modules/vr/NavigatorVR.h
index 4a4b2a3e8d64dfeeb5a4d6bbd9d50ad63cab8297..e888bbc812a9eee03b2102e63b98cf0b9901212e 100644
--- a/third_party/WebKit/Source/modules/vr/NavigatorVR.h
+++ b/third_party/WebKit/Source/modules/vr/NavigatorVR.h
@@ -10,6 +10,7 @@
 #include "modules/ModulesExport.h"
 #include "modules/vr/VRDisplay.h"
 #include "modules/vr/VRDisplayEvent.h"
+#include "platform/AsyncMethodRunner.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebVector.h"
@@ -21,7 +22,7 @@ class Document;
 class Navigator;
 class VRController;
 
-class MODULES_EXPORT NavigatorVR final : public GarbageCollectedFinalized<NavigatorVR>, public Supplement<Navigator>, public DOMWindowProperty {
+class MODULES_EXPORT NavigatorVR final : public GarbageCollectedFinalized<NavigatorVR>, public Supplement<Navigator>, public DOMWindowProperty, public LocalDOMWindow::EventListenerObserver {
     USING_GARBAGE_COLLECTED_MIXIN(NavigatorVR);
     WTF_MAKE_NONCOPYABLE(NavigatorVR);
 public:
@@ -35,6 +36,8 @@ public:
     VRController* controller();
     Document* document();
 
+    void fireVREvent(VRDisplayEvent*);
+
     DECLARE_VIRTUAL_TRACE();
 
 private:
@@ -47,7 +50,20 @@ private:
 
     void fireVRDisplayPresentChange(VRDisplay*);
 
+    void dispatchOneEvent();
+
+    // LocalDOMWindow::EventListenerObserver
+    void didAddEventListener(LocalDOMWindow*, const AtomicString&) override;
+    void didRemoveEventListener(LocalDOMWindow*, const AtomicString&) override;
+    void didRemoveAllEventListeners(LocalDOMWindow*) override;
+    void didRemoveVREventListeners();
+
+    bool isVREvent(const AtomicString&);
+
     Member<VRController> m_controller;
+    bool m_hasEventListener;
+    HeapDeque<Member<VRDisplayEvent>> m_pendingEvents;
+    Member<AsyncMethodRunner<NavigatorVR>> m_dispatchOneEventRunner;
 };
 
 } // namespace blink