Adding WebVR interface to Blink

Source/modules/vr/VRPositionState.cpp

Index: Source/modules/vr/VRPositionState.cpp
diff --git a/Source/modules/vr/VRPositionState.cpp b/Source/modules/vr/VRPositionState.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..47a9869d6e02b472f77275b3f7d7cf9cdc86b248
--- /dev/null
+++ b/Source/modules/vr/VRPositionState.cpp
@@ -0,0 +1,53 @@
+// 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/VRPositionState.h"
+
+namespace blink {
+
+namespace {
+
+DOMPoint* VecToDomPoint(const blink::WebVRVector4& vec, bool valid)
+{
+    if (valid)
+        return DOMPoint::create(vec.x, vec.y, vec.z, vec.w);
+    return nullptr;
+}
+DOMPoint* VecToDomPoint(const blink::WebVRVector3& vec, bool valid)
+{
+    if (valid)
+        return DOMPoint::create(vec.x, vec.y, vec.z, 0.0);
+    return nullptr;
+}
+
+} // namespace
+
+VRPositionState::VRPositionState()
+    : m_timeStamp(0.0)
+{
+}
+
+void VRPositionState::setState(const blink::WebHMDSensorState &state)
+{
+    m_timeStamp = state.timestamp;
+    m_orientation = VecToDomPoint(state.orientation, state.flags & WebVRSensorStateOrientation);
+    m_position = VecToDomPoint(state.position, state.flags & WebVRSensorStatePosition);
+    m_angularVelocity = VecToDomPoint(state.angularVelocity, state.flags & WebVRSensorStateAngularVelocity);
+    m_linearVelocity = VecToDomPoint(state.linearVelocity, state.flags & WebVRSensorStateLinearVelocity);
+    m_angularAcceleration = VecToDomPoint(state.angularAcceleration, state.flags & WebVRSensorStateAngularAcceleration);
+    m_linearAcceleration =  VecToDomPoint(state.linearAcceleration, state.flags & WebVRSensorStateLinearAcceleration);
+}
+
+void VRPositionState::trace(Visitor* visitor)
+{
+    visitor->trace(m_orientation);
+    visitor->trace(m_position);
+    visitor->trace(m_angularVelocity);
+    visitor->trace(m_linearVelocity);
+    visitor->trace(m_angularAcceleration);
+    visitor->trace(m_linearAcceleration);
+}
+
+} // namespace blink