Add initial Screen Orientation API support: IDL changes

Source/modules/screen_orientation/ScreenOrientation.h

Index: Source/modules/screen_orientation/ScreenOrientation.h
diff --git a/Source/modules/screen_orientation/ScreenOrientation.h b/Source/modules/screen_orientation/ScreenOrientation.h
new file mode 100644
index 0000000000000000000000000000000000000000..ca05ff0fe474ee72aa2f03fb3bbac7bb1acd5c92
--- /dev/null
+++ b/Source/modules/screen_orientation/ScreenOrientation.h
@@ -0,0 +1,42 @@
+// 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 ScreenOrientation_h
+#define ScreenOrientation_h
+
+#include "core/dom/ActiveDOMObject.h"
+#include "core/events/EventTarget.h"
+#include "platform/Supplementable.h"
+#include "wtf/Vector.h"
+#include "wtf/text/AtomicString.h"
+#include "wtf/text/WTFString.h"
+
+namespace WebCore {
+
+class Screen;
+
+class ScreenOrientation FINAL : public Supplement<Screen>, ActiveDOMObject {

[Inactive, 2014/02/16 02:01:57]

Based on your comments on my other CL, I kept only ActiveDOMObject. Please let
me know if you think this is not the right thing to do.

[abarth-chromium, 2014/02/16 04:03:48]

Given that you're supplementing Screen, we might want to start with
DOMWindowProperty because Screen is a DOMWindowProperty.

Really, we should merge a bunch of these observer interfaces.  There isn't any
reason for DOMWindowProperty and ActiveDOMObject to be separate concepts now
that we've fixed DOMWindow's lifetime.

[Inactive, 2014/02/16 04:35:56]

Done.

+public:
+    static ScreenOrientation* from(Screen*);
+    virtual ~ScreenOrientation();
+
+    DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(orientationchange);
+
+    static const AtomicString& orientation(Screen*);
+    static bool lockOrientation(Screen*, const Vector<String>& orientations);
+    static bool lockOrientation(Screen*, const AtomicString& orientation);
+    static void unlockOrientation(Screen*);
+
+    void orientationChanged();
+
+private:
+    explicit ScreenOrientation(Screen*);
+    static const char* supplementName();
+    Screen* screen() const;
+};
+
+} // namespace WebCore
+
+#endif // ScreenOrientation_h