Adding WebVR interface to Blink

Source/modules/vr/VRPositionState.idl

Index: Source/modules/vr/VRPositionState.idl
diff --git a/Source/modules/vr/VRPositionState.idl b/Source/modules/vr/VRPositionState.idl
new file mode 100644
index 0000000000000000000000000000000000000000..53b243eae7d73fb694f04c730336f90db0e4a24d
--- /dev/null
+++ b/Source/modules/vr/VRPositionState.idl
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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+[
+    RuntimeEnabled=VRDevice,
+    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;
+};