Updated Blink WebVR interfaces to WebVR v1 spec

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

Index: third_party/WebKit/Source/modules/vr/VRStageParameters.idl
diff --git a/third_party/WebKit/Source/modules/vr/VRStageParameters.idl b/third_party/WebKit/Source/modules/vr/VRStageParameters.idl
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+// Copyright 2016 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.
+
+// http://mozvr.github.io/webvr-spec/webvr.html#vrstageparameters
+[
+    RuntimeEnabled=WebVR
+] interface VRStageParameters {
+  // A 16 element array containing the components of a 4x4 transform
+  // matrix.  This matrix transforms the sitting space position
+  // returned by get{Immediate}Pose() to a standing space position.
+  readonly attribute Float32Array sittingToStandingTransform;
+
+  // Dimensions of the play area bounds. The bounds are defined
+  // as an axis aligned rectangle on the floor.
+  // The center of the rectangle is at (0,0,0) in standing space
+  // coordinates.
+  // These bounds are defined for safety purposes.
+  // Content should not require the user to move beyond these
+  // bounds; however, it is possible for the user to ignore
+  // the bounds resulting in position values outside of
+  // this rectangle.
+  readonly attribute float sizeX;
+  readonly attribute float sizeZ;
+};