Add initial Blink-side support for the Screen Orientation API

public/web/WebScreenOrientationController.h

Index: public/web/WebScreenOrientationController.h
diff --git a/public/web/WebScreenOrientationController.h b/public/web/WebScreenOrientationController.h
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+++ b/public/web/WebScreenOrientationController.h
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+// 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 WebScreenOrientationController_h
+#define WebScreenOrientationController_h
+
+#include "WebScreenOrientation.h"
+#include "public/platform/WebCommon.h"
+#include "public/platform/WebNonCopyable.h"
+
+namespace WebCore { class ScreenOrientationController; }
+
+namespace blink {
+
+class WebScreenOrientationController : public WebNonCopyable {
+public:
+    BLINK_EXPORT void orientationChanged(WebScreenOrientation);
+
+#if BLINK_IMPLEMENTATION
+    WebScreenOrientationController(WebCore::ScreenOrientationController* c)
+        : m_private(c)
+    {
+    }
+
+    WebCore::ScreenOrientationController* controller() const { return m_private; }
+#endif
+
+private:
+    // No implementation for the default constructor. Declared private to ensure that no instances
+    // can be created by the consumers of Blink.
+    WebScreenOrientationController();
+
+    WebCore::ScreenOrientationController* m_private;
+};
+
+} // namespace blink
+
+#endif // WebScreenOrientationController_h