Add the text direction to the WebScrollbar interface.

Source/core/platform/Scrollbar.cpp

Index: Source/core/platform/Scrollbar.cpp
diff --git a/Source/core/platform/Scrollbar.cpp b/Source/core/platform/Scrollbar.cpp
index 8e640cc5ff04afe7a6fb3fdde0831f1f39960c87..bcc23679c69bae731eb30f61c57dde17dfede991 100644
--- a/Source/core/platform/Scrollbar.cpp
+++ b/Source/core/platform/Scrollbar.cpp
@@ -55,8 +55,7 @@ PassRefPtr<Scrollbar> Scrollbar::createNativeScrollbar(ScrollableArea* scrollabl
     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)
@@ -122,6 +121,13 @@ 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);