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..3ebdbce97bf5ae81ed8230d41602e6b80f464d20
--- /dev/null
+++ b/Source/modules/vr/PositionSensorVRDevice.cpp
@@ -0,0 +1,38 @@
+// 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.
+
+#include "config.h"
+#include "modules/vr/PositionSensorVRDevice.h"
+
+#include "public/platform/Platform.h"
+
+namespace blink {
+
+PositionSensorVRDevice::PositionSensorVRDevice(VRHardwareUnit* hardwareUnit)
+    : VRDevice(hardwareUnit)
+{
+}
+
+VRPositionState* PositionSensorVRDevice::getState()
+{
+    // FIXME: This value should be stable for the duration of a requestAnimationFrame callback
+    return hardwareUnit()->getPositionState();
+}
+
+VRPositionState* PositionSensorVRDevice::getImmediateState()
+{
+    return hardwareUnit()->getPositionState();
+}
+
+void PositionSensorVRDevice::resetSensor()
+{
+    blink::Platform::current()->resetVRSensor(index());
+}
+
+void PositionSensorVRDevice::trace(Visitor* visitor)
+{
+    VRDevice::trace(visitor);
+}
+
+} // namespace blink