Add support of vrdisplayconnect and vrdisplaydisconnect event

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

Index: third_party/WebKit/Source/modules/vr/NavigatorVR.cpp
diff --git a/third_party/WebKit/Source/modules/vr/NavigatorVR.cpp b/third_party/WebKit/Source/modules/vr/NavigatorVR.cpp
index b3acb36935316dd79addae9993ee094dfba11e3a..76778d047a0f6c89364f251cdc1474829108a3e5 100644
--- a/third_party/WebKit/Source/modules/vr/NavigatorVR.cpp
+++ b/third_party/WebKit/Source/modules/vr/NavigatorVR.cpp
@@ -81,14 +81,56 @@ Document* NavigatorVR::document()
 DEFINE_TRACE(NavigatorVR)
 {
     visitor->trace(m_controller);
+    visitor->trace(m_pendingEvents);
+    visitor->trace(m_dispatchOneEventRunner);
 
     Supplement<Navigator>::trace(visitor);
     DOMWindowProperty::trace(visitor);
 }
 
+bool NavigatorVR::isVREvent(const AtomicString& eventType)
+{
+    return eventType == EventTypeNames::vrdisplayconnect
+        || eventType == EventTypeNames::vrdisplaydisconnect
+        || eventType == EventTypeNames::vrdisplayactivate
+        || eventType == EventTypeNames::vrdisplaydeactivate;
+}
+
+void NavigatorVR::didAddEventListener(LocalDOMWindow*, const AtomicString& eventType)
+{
+    if (isVREvent(eventType)) {
+        m_hasEventListener = true;
+    }
+}
+
+void NavigatorVR::didRemoveEventListener(LocalDOMWindow* window, const AtomicString& eventType)
+{
+    if (isVREvent(eventType)
+        && !window->hasEventListeners(EventTypeNames::vrdisplayconnect)
+        && !window->hasEventListeners(EventTypeNames::vrdisplaydisconnect)) {
+        didRemoveVREventListeners();
+    }
+}
+
+void NavigatorVR::didRemoveAllEventListeners(LocalDOMWindow*)
+{
+    didRemoveVREventListeners();
+}
+
+void NavigatorVR::didRemoveVREventListeners()
+{
+    m_hasEventListener = false;
+    m_dispatchOneEventRunner->stop();
+    m_pendingEvents.clear();
+}
+
 NavigatorVR::NavigatorVR(LocalFrame* frame)
     : DOMWindowProperty(frame)
+    , m_hasEventListener(false)
+    , m_dispatchOneEventRunner(AsyncMethodRunner<NavigatorVR>::create(this, &NavigatorVR::dispatchOneEvent))
 {
+    if (frame)
+        frame->localDOMWindow()->registerEventListenerObserver(this);
 }
 
 NavigatorVR::~NavigatorVR()
@@ -108,4 +150,23 @@ void NavigatorVR::fireVRDisplayPresentChange(VRDisplay* display)
     }
 }
 
+void NavigatorVR::fireVREvent(VRDisplayEvent* event)

[bajones, 2016/09/06 23:25:46]

Lets have this function call m_frame->localDOMWindow()->enqueueWindowEvent() as
with fireVRDisplayPresentChange above. Then we don't need most of the event
handling changes in this file.

+{
+    m_pendingEvents.append(event);
+    m_dispatchOneEventRunner->runAsync();
+}
+
+void NavigatorVR::dispatchOneEvent()
+{
+    DCHECK(frame());
+    DCHECK(frame()->domWindow());
+    DCHECK(!m_pendingEvents.isEmpty());
+
+    if (m_frame)
+        m_frame->domWindow()->dispatchEvent(m_pendingEvents.takeFirst());
+
+    if (!m_pendingEvents.isEmpty())
+        m_dispatchOneEventRunner->runAsync();
+}
+
 } // namespace blink