Adding WebVR interface to Blink

Source/modules/vr/PositionSensorVRDevice.cpp

Index: Source/modules/vr/PositionSensorVRDevice.cpp
diff --git a/Source/modules/vr/PositionSensorVRDevice.cpp b/Source/modules/vr/PositionSensorVRDevice.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..958415eec0caa780e97718179a8c7cf5f0db0ec6
--- /dev/null
+++ b/Source/modules/vr/PositionSensorVRDevice.cpp
@@ -0,0 +1,32 @@
+// 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.
+
+#include "config.h"
+#include "modules/vr/PositionSensorVRDevice.h"
+
+#include "public/platform/Platform.h"
+
+namespace blink {
+
+PositionSensorVRDevice::PositionSensorVRDevice(VRHardwareUnit* hardwareUnit)
+    : VRDevice(hardwareUnit)
+{
+}
+
+VRPositionState* PositionSensorVRDevice::getState(double timeOffset)
+{
+    return hardwareUnit()->getPositionState(timeOffset);
+}
+
+void PositionSensorVRDevice::zeroSensor()
+{
+    blink::Platform::current()->resetVRSensor(index());
+}
+
+void PositionSensorVRDevice::trace(Visitor* visitor)
+{
+    VRDevice::trace(visitor);
+}
+
+} // namespace blink