Add the text direction to the WebScrollbar interface.

Source/core/platform/Scrollbar.cpp

 /*
  * Copyright (C) 2004, 2006, 2008 Apple 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 37 matching lines @@
 #define THUMB_POSITION_AFFECTS_BUTTONS
 #endif
 
 namespace WebCore {
 
 PassRefPtr<Scrollbar> Scrollbar::createNativeScrollbar(ScrollableArea* scrollableArea, ScrollbarOrientation orientation, ScrollbarControlSize size)
 {
     return adoptRef(new Scrollbar(scrollableArea, orientation, size));
 }
 
-Scrollbar::Scrollbar(ScrollableArea* scrollableArea, ScrollbarOrientation orientation, ScrollbarControlSize controlSize,
-                     ScrollbarTheme* theme)
+Scrollbar::Scrollbar(ScrollableArea* scrollableArea, ScrollbarOrientation orientation, ScrollbarControlSize controlSize, ScrollbarTheme* theme)
     : m_scrollableArea(scrollableArea)
     , m_orientation(orientation)
     , m_controlSize(controlSize)
     , m_theme(theme)
     , m_visibleSize(0)
     , m_totalSize(0)
     , m_currentPos(0)
     , m_dragOrigin(0)
     , m_hoveredPart(NoPart)
     , m_pressedPart(NoPart)
@@ skipping 45 matching lines @@
 bool Scrollbar::isScrollableAreaActive() const
 {
     return m_scrollableArea && m_scrollableArea->isActive();
 }
 
 bool Scrollbar::isScrollViewScrollbar() const
 {
     return parent() && parent()->isFrameView() && toFrameView(parent())->isScrollViewScrollbar(this);
 }
 
+TextDirection Scrollbar::textDirection() const
+{
+    if (m_orientation == VerticalScrollbar && m_scrollableArea)
+        return m_scrollableArea->textDirection();
+    return LTR;
+}
+
 void Scrollbar::offsetDidChange()
 {
     ASSERT(m_scrollableArea);
 
     float position = scrollableAreaCurrentPos();
     if (position == m_currentPos)
         return;
 
     int oldThumbPosition = theme()->thumbPosition(this);
     m_currentPos = position;
@@ skipping 454 matching lines @@
     if (!m_scrollableArea)
         return 0;
 
     if (m_orientation == HorizontalScrollbar)
         return m_scrollableArea->scrollPosition().x() - m_scrollableArea->minimumScrollPosition().x();
 
     return m_scrollableArea->scrollPosition().y() - m_scrollableArea->minimumScrollPosition().y();
 }
 
 } // namespace WebCore