Add initial Blink-side support for the Screen Orientation API

Source/web/ScreenOrientationClientProxy.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 ScreenOrientationClientProxy_h
+#define ScreenOrientationClientProxy_h
+
+#include "modules/screen_orientation/ScreenOrientationClient.h"
+
+namespace WebCore {
+class ScreenOrientationController;
+}
+
+namespace blink {
+
+class WebScreenOrientationClient;
+
+class ScreenOrientationClientProxy FINAL : public WebCore::ScreenOrientationClient {
+public:
+    static PassOwnPtr<ScreenOrientationClientProxy> create(WebScreenOrientationClient* client)
+    {
+        return adoptPtr(new ScreenOrientationClientProxy(client));
+    }
+
+    void setController(WebCore::ScreenOrientationController*);
+    virtual void lockOrientation(WebCore::ScreenOrientationValues orientations) OVERRIDE;
+    virtual void unlockOrientation() OVERRIDE;
+
+private:
+    explicit ScreenOrientationClientProxy(WebScreenOrientationClient*);
+
+    WebScreenOrientationClient* m_client;
+};
+
+} // namespace blink
+
+#endif // ScreenOrientationClientProxy_h