Add the text direction to the WebScrollbar interface.

Source/core/platform/Scrollbar.h

 /*
  * Copyright (C) 2004, 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef Scrollbar_h
 #define Scrollbar_h
 
 #include "core/platform/ScrollTypes.h"
 #include "core/platform/ScrollbarThemeClient.h"
 #include "core/platform/Timer.h"
 #include "core/platform/Widget.h"
+#include "core/platform/text/TextDirection.h"
 #include "wtf/MathExtras.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
 class GraphicsContext;
 class IntRect;
 class PlatformGestureEvent;
 class PlatformMouseEvent;
 class ScrollableArea;
 class ScrollbarTheme;
 
 class Scrollbar : public Widget,
                   public ScrollbarThemeClient {
 
 public:
     // Must be implemented by platforms that can't simply use the Scrollbar base class.  Right now the only platform that is not using the base class is GTK.
-    static PassRefPtr<Scrollbar> createNativeScrollbar(ScrollableArea*, ScrollbarOrientation orientation, ScrollbarControlSize size);
+    static PassRefPtr<Scrollbar> createNativeScrollbar(ScrollableArea*, ScrollbarOrientation, ScrollbarControlSize);
 
     virtual ~Scrollbar();
 
     // ScrollbarThemeClient implementation.
     virtual int x() const { return Widget::x(); }
     virtual int y() const { return Widget::y(); }
     virtual int width() const { return Widget::width(); }
     virtual int height() const { return Widget::height(); }
     virtual IntSize size() const { return Widget::size(); }
     virtual IntPoint location() const { return Widget::location(); }
 
     virtual ScrollView* parent() const { return Widget::parent(); }
     virtual ScrollView* root() const { return Widget::root(); }
 
     virtual void setFrameRect(const IntRect&);
     virtual IntRect frameRect() const { return Widget::frameRect(); }
 
     virtual void invalidate() { Widget::invalidate(); }
     virtual void invalidateRect(const IntRect&);
 
     virtual ScrollbarOverlayStyle scrollbarOverlayStyle() const;
     virtual void getTickmarks(Vector<IntRect>&) const;
     virtual bool isScrollableAreaActive() const;
     virtual bool isScrollViewScrollbar() const;
 
     virtual IntPoint convertFromContainingWindow(const IntPoint& windowPoint) { return Widget::convertFromContainingWindow(windowPoint); }
 
     virtual bool isCustomScrollbar() const { return false; }
     virtual ScrollbarOrientation orientation() const { return m_orientation; }
+    TextDirection textDirection() const;
 
     virtual int value() const { return lroundf(m_currentPos); }
     virtual float currentPos() const { return m_currentPos; }
     virtual int visibleSize() const { return m_visibleSize; }
     virtual int totalSize() const { return m_totalSize; }
     virtual int maximum() const { return m_totalSize - m_visibleSize; }
     virtual ScrollbarControlSize controlSize() const { return m_controlSize; }
 
     virtual ScrollbarPart pressedPart() const { return m_pressedPart; }
     virtual ScrollbarPart hoveredPart() const { return m_hoveredPart; }
@@ skipping 98 matching lines @@
 private:
     virtual bool isScrollbar() const { return true; }
     virtual AXObjectCache* existingAXObjectCache() const;
 
     float scrollableAreaCurrentPos() const;
 };
 
 } // namespace WebCore
 
 #endif // Scrollbar_h