Add the text direction to the WebScrollbar interface.

Source/core/platform/chromium/support/WebScrollbarImpl.cpp

Index: Source/core/platform/chromium/support/WebScrollbarImpl.cpp
diff --git a/Source/core/platform/chromium/support/WebScrollbarImpl.cpp b/Source/core/platform/chromium/support/WebScrollbarImpl.cpp
index ecfc41bc92e124bd4819b344f65471043cb6f6bc..f88bfbcd2258152e8dacc3691e82982500cddb75 100644
--- a/Source/core/platform/chromium/support/WebScrollbarImpl.cpp
+++ b/Source/core/platform/chromium/support/WebScrollbarImpl.cpp
@@ -28,6 +28,7 @@
 
 #include "core/platform/Scrollbar.h"
 #include "core/platform/graphics/IntRect.h"
+#include "core/platform/text/TextDirection.h"
 
 namespace WebKit {
 
@@ -118,6 +119,11 @@ WebScrollbar::Orientation WebScrollbarImpl::orientation() const
     return static_cast<WebScrollbar::Orientation>(m_scrollbar->orientation());
 }
 
+bool WebScrollbarImpl::isRightToLeft() const
+{
+    return m_scrollbar->textDirection() == WebCore::RTL;
+}
+
 bool WebScrollbarImpl::isCustomScrollbar() const
 {
     return m_scrollbar->isCustomScrollbar();