Adding WebVR temporary presentation handling on mobile

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 c83745a77b8125b5196512b5607c1c35eaab4eb7..4a4b2a3e8d64dfeeb5a4d6bbd9d50ad63cab8297 100644
--- a/third_party/WebKit/Source/modules/vr/NavigatorVR.h
+++ b/third_party/WebKit/Source/modules/vr/NavigatorVR.h
@@ -9,6 +9,7 @@
 #include "core/frame/DOMWindowProperty.h"
 #include "modules/ModulesExport.h"
 #include "modules/vr/VRDisplay.h"
+#include "modules/vr/VRDisplayEvent.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebVector.h"
@@ -44,6 +45,8 @@ private:
 
     static const char* supplementName();
 
+    void fireVRDisplayPresentChange(VRDisplay*);
+
     Member<VRController> m_controller;
 };