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());

[mdempsky, 2015/05/11 22:48:40]

Should resetting a VR sensor be global like this?  It seems like if two frames
both have access to the same VR sensor, then one frame calling resetSensor would
reset the sensor as seen by both pages.  Is that intentional?

+}
+
+void PositionSensorVRDevice::trace(Visitor* visitor)
+{
+    VRDevice::trace(visitor);
+}
+
+} // namespace blink