Adding WebVR temporary presentation handling on mobile

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 f400ceeb49a1c8fef85de4e9d101bf2e4fa4be0f..b3acb36935316dd79addae9993ee094dfba11e3a 100644
--- a/third_party/WebKit/Source/modules/vr/NavigatorVR.cpp
+++ b/third_party/WebKit/Source/modules/vr/NavigatorVR.cpp
@@ -100,4 +100,12 @@ const char* NavigatorVR::supplementName()
     return "NavigatorVR";
 }
 
+void NavigatorVR::fireVRDisplayPresentChange(VRDisplay* display)
+{
+    if (m_frame && m_frame->localDOMWindow()) {
+        m_frame->localDOMWindow()->enqueueWindowEvent(
+            VRDisplayEvent::create(EventTypeNames::vrdisplaypresentchange, true, false, display, ""));
+    }
+}
+
 } // namespace blink