Use Promises for screen.lockOrientation().

Source/modules/screen_orientation/LockOrientationCallback.h

+// 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.
+
+#ifndef LockOrientationCallback_h
+#define LockOrientationCallback_h
+
+#include "public/platform/WebCallbacks.h"
+#include "public/platform/WebScreenOrientationType.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+
+namespace blink {
+class WebDOMException;
+}
+
+namespace WebCore {
+
+class ScriptPromiseResolverWithContext;
+
+class LockOrientationCallback FINAL : public blink::WebCallbacks<blink::WebScreenOrientationType, blink::WebDOMException> {

[Inactive, 2014/05/16 13:25:26]

Looks like we could reuse CallbackPromiseAdapter ?

[mlamouri (slow - plz ping), 2014/05/21 13:45:02]

That would require me to have a wrapper for WebScreenOrientationType and
WebDOMException. That is too much overhead IMO.

[Inactive, 2014/05/21 13:48:07]

I don't understand, why cannot we use CallbackPromiseAdapter<blink::WebScree
    nOrientationType, blink::WebDOMException> type instead of this class? They
seem identical.

+public:
+    LockOrientationCallback(PassRefPtr<ScriptPromiseResolverWithContext>);
+    virtual ~LockOrientationCallback();
+
+    virtual void onSuccess(blink::WebScreenOrientationType*) OVERRIDE;
+    virtual void onError(blink::WebDOMException*) OVERRIDE;
+
+private:
+    RefPtr<ScriptPromiseResolverWithContext> m_resolver;
+    WTF_MAKE_NONCOPYABLE(LockOrientationCallback);
+};
+
+} // namespace WebCore
+
+#endif // LockOrientationCallback_h
+