Implement DOMPoint using v8 extras.

third_party/WebKit/Source/modules/vr/VRPositionState.idl

Index: third_party/WebKit/Source/modules/vr/VRPositionState.idl
diff --git a/third_party/WebKit/Source/modules/vr/VRPositionState.idl b/third_party/WebKit/Source/modules/vr/VRPositionState.idl
index 4a22a02984d679bb7e67fb2fb8b0a61e6b41116a..f3a61adc0146124f669a0e410e09dcb04be03559 100644
--- a/third_party/WebKit/Source/modules/vr/VRPositionState.idl
+++ b/third_party/WebKit/Source/modules/vr/VRPositionState.idl
@@ -8,10 +8,10 @@
     GarbageCollected,
 ] interface VRPositionState {
     readonly attribute double timeStamp;
-    readonly attribute DOMPoint? position;
-    readonly attribute DOMPoint? linearVelocity;
-    readonly attribute DOMPoint? linearAcceleration;
-    readonly attribute DOMPoint? orientation;
-    readonly attribute DOMPoint? angularVelocity;
-    readonly attribute DOMPoint? angularAcceleration;
+    [CallWith=ScriptState] readonly attribute any position;
+    [CallWith=ScriptState] readonly attribute any linearVelocity;
+    [CallWith=ScriptState] readonly attribute any linearAcceleration;
+    [CallWith=ScriptState] readonly attribute any orientation;
+    [CallWith=ScriptState] readonly attribute any angularVelocity;
+    [CallWith=ScriptState] readonly attribute any angularAcceleration;
 };