Add the text direction to the WebScrollbar interface.

Source/web/WebPluginScrollbarImpl.cpp

 /*
  * Copyright (C) 2012 Google 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 171 matching lines @@
     return static_cast<WebScrollbar::ScrollbarOverlayStyle>(m_scrollbar->scrollbarOverlayStyle());
 }
 
 WebScrollbar::Orientation WebPluginScrollbarImpl::orientation() const
 {
     if (m_scrollbar->orientation() == WebCore::HorizontalScrollbar)
         return WebScrollbar::Horizontal;
     return WebScrollbar::Vertical;
 }
 
+bool WebPluginScrollbarImpl::isRightToLeft() const
+{
+    return false;
+}
+
 bool WebPluginScrollbarImpl::isCustomScrollbar() const
 {
     return m_scrollbar->isCustomScrollbar();
 }
 
 void WebPluginScrollbarImpl::setLocation(const WebRect& rect)
 {
     IntRect oldRect = m_scrollbar->frameRect();
     m_scrollbar->setFrameRect(rect);
     if (WebRect(oldRect) != rect)
@@ skipping 158 matching lines @@
     WebCore::ScrollDirection scrollDirection;
     WebCore::ScrollGranularity scrollGranularity;
     if (WebViewImpl::mapKeyCodeForScroll(keyCode, &scrollDirection, &scrollGranularity)) {
         // Will return false if scroll direction wasn't compatible with this scrollbar.
         return m_group->scroll(scrollDirection, scrollGranularity);
     }
     return false;
 }
 
 } // namespace WebKit