Adding WebVR temporary presentation handling on mobile

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 a4820fb958f1c02f78afa955b6968ebbc4c6675b..5ffeaefc9e65887babaf7b40a1fd163bfd4c55e3 100644
--- a/third_party/WebKit/Source/modules/vr/VRDisplay.h
+++ b/third_party/WebKit/Source/modules/vr/VRDisplay.h
@@ -11,6 +11,7 @@
 #include "device/vr/vr_service.mojom-blink.h"
 #include "modules/vr/VRDisplayCapabilities.h"
 #include "modules/vr/VRLayer.h"
+#include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebGraphicsContext3DProvider.h"
 #include "public/platform/WebThread.h"
@@ -85,6 +86,8 @@ private:
     void didProcessTask() override;
     void willProcessTask() override { }
 
+    void onFullscreenCheck(TimerBase*);
+
     Member<NavigatorVR> m_navigatorVR;
     unsigned m_displayId;
     String m_displayName;
@@ -97,6 +100,9 @@ private:
     Member<VREyeParameters> m_eyeParametersLeft;
     Member<VREyeParameters> m_eyeParametersRight;
     Member<VRPose> m_framePose;
+    VRLayer m_layer;
+
+    Timer<VRDisplay> m_fullscreenCheckTimer;
 };
 
 using VRDisplayVector = HeapVector<Member<VRDisplay>>;