Add initial Blink-side support for the Screen Orientation API

public/web/WebScreenOrientationClient.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 WebScreenOrientationClient_h
+#define WebScreenOrientationClient_h
+
+#include "WebScreenOrientation.h"
+
+namespace blink {
+
+class WebScreenOrientationController;
+
+class WebScreenOrientationClient {
+public:
+    virtual ~WebScreenOrientationClient() { }
+
+    virtual void lockOrientation(WebScreenOrientations) = 0;

[kenneth.r.christiansen, 2014/02/05 17:42:00]

The spec (editor draft at least) says that if any of the orientations isnt
supported you should return false. (or in the future, make the Promise fail)

[Inactive, 2014/02/05 18:22:44]

Done.

+    virtual void unlockOrientation() = 0;
+
+    virtual void setController(WebScreenOrientationController*) = 0;
+};
+
+} // namespace blink
+
+#endif // WebScreenOrientationClient_h