Use Promises for screen.lockOrientation().

Source/modules/screen_orientation/LockOrientationCallback.cpp

Index: Source/modules/screen_orientation/LockOrientationCallback.cpp
diff --git a/Source/modules/screen_orientation/LockOrientationCallback.cpp b/Source/modules/screen_orientation/LockOrientationCallback.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b4f3588fe2eb58b8444efda4cd0da5cd53a014e9
--- /dev/null
+++ b/Source/modules/screen_orientation/LockOrientationCallback.cpp
@@ -0,0 +1,34 @@
+// 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/screen_orientation/LockOrientationCallback.h"
+
+#include "bindings/v8/ScriptPromiseResolverWithContext.h"
+#include "bindings/v8/V8Binding.h"
+#include "modules/screen_orientation/ScreenOrientation.h"
+#include "public/platform/WebDOMException.h"
+
+namespace WebCore {
+
+LockOrientationCallback::LockOrientationCallback(PassRefPtr<ScriptPromiseResolverWithContext> resolver)
+    : m_resolver(resolver)
+{
+}
+
+LockOrientationCallback::~LockOrientationCallback()
+{
+}
+
+void LockOrientationCallback::onSuccess(blink::WebScreenOrientationType* orientation)
+{
+    m_resolver->resolve(ScreenOrientation::orientationTypeToString(*orientation));
+}
+
+void LockOrientationCallback::onError(blink::WebDOMException* error)
+{
+    m_resolver->reject(error->toV8Value());
+}
+
+} // namespace WebCore