[screen-orientation] Expose orientation info in OrientationInformation interface.

Source/modules/screen_orientation/ScreenOrientation.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 ScreenOrientation_h
 #define ScreenOrientation_h
 
 #include "core/frame/DOMWindowProperty.h"
 #include "platform/Supplementable.h"
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebScreenOrientationLockType.h"
 #include "public/platform/WebScreenOrientationType.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class Document;
+class OrientationInformation;
 class ScriptPromise;
 class ScriptState;
 class Screen;
 
 class ScreenOrientation FINAL : public NoBaseWillBeGarbageCollectedFinalized<ScreenOrientation>, public WillBeHeapSupplement<Screen>, DOMWindowProperty {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ScreenOrientation);
 public:
     static ScreenOrientation& from(Screen&);
     virtual ~ScreenOrientation();
 
-    static const AtomicString& orientation(Screen&);
+    static OrientationInformation* orientation(Screen&);
     static ScriptPromise lockOrientation(ScriptState*, Screen&, const AtomicString& orientation);
     static void unlockOrientation(Screen&);
 
     // Helper being used by this class and LockOrientationCallback.
     static const AtomicString& orientationTypeToString(blink::WebScreenOrientationType);
 
     virtual void trace(Visitor* visitor) OVERRIDE { WillBeHeapSupplement<Screen>::trace(visitor); }
 
 private:
     explicit ScreenOrientation(Screen&);
 
     static const char* supplementName();
     Document* document() const;
 };
 
 } // namespace WebCore
 
 #endif // ScreenOrientation_h