Adding Chrome-side WebVR interface

content/common/vr_service.mojom

Index: content/common/vr_service.mojom
diff --git a/content/common/vr_service.mojom b/content/common/vr_service.mojom
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+// Copyright 2015 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.
+
+module content;
+
+struct VRVector3 {
+  float x;
+  float y;
+  float z;
+};
+
+struct VRVector4 {
+  float x;
+  float y;
+  float z;
+  float w;
+};
+
+struct VRRect {
+  int32 x;
+  int32 y;
+  int32 width;
+  int32 height;
+};
+
+// A field of view, given by 4 degrees describing the view from a center point.
+struct VRFieldOfView {
+  float upDegrees;
+  float downDegrees;
+  float leftDegrees;
+  float rightDegrees;
+};
+
+// A sensor's position, orientation, velocity, and acceleration state at the
+// given timestamp.
+struct VRSensorState {
+  double timestamp;
+  uint32 frameIndex;
+  VRVector4? orientation;
+  VRVector3? position;
+  VRVector3? angularVelocity;
+  VRVector3? linearVelocity;
+  VRVector3? angularAcceleration;
+  VRVector3? linearAcceleration;
+};
+
+// Information about the optical properties for an eye in an HMD.
+struct VREyeParameters {
+  VRFieldOfView minimumFieldOfView;
+  VRFieldOfView maximumFieldOfView;
+  VRFieldOfView recommendedFieldOfView;
+  VRVector3 eyeTranslation;
+  VRRect renderRect;
+};
+
+// Information pertaining to Head Mounted Displays.
+struct VRHMDInfo {
+  VREyeParameters leftEye;
+  VREyeParameters rightEye;
+};
+
+struct VRDeviceInfo {
+   uint32 index;
+   string deviceName;
+   VRHMDInfo? hmdInfo;
+};
+
+interface VRService {
+  GetDevices() => (array<VRDeviceInfo> devices);
+  GetSensorState(uint32 index) => (VRSensorState state);
+  ResetSensor(uint32 index);
+};