A tricky fix for Issue 1845....

webkit/glue/webview_impl.cc

Index: webkit/glue/webview_impl.cc
===================================================================
--- webkit/glue/webview_impl.cc	(revision 11937)
+++ webkit/glue/webview_impl.cc	(working copy)
@@ -1192,6 +1192,37 @@
   return true;
 }
 
+void WebViewImpl::SetTextDirection(WebTextDirection direction) {
+  // The Editor::setBaseWritingDirection() function checks if we can change
+  // the text direction of the selected node and updates its DOM "dir"
+  // attribute and its CSS "direction" property.
+  // So, we just call the function as Safari does.
+  const Frame* focused = GetFocusedWebCoreFrame();
+  if (!focused)
+    return;
+  Editor* editor = focused->editor();
+  if (!editor || !editor->canEdit())
+    return;
+
+  switch (direction) {
+    case WEB_TEXT_DIRECTION_DEFAULT:
+      editor->setBaseWritingDirection(WebCore::NaturalWritingDirection);
+      break;
+
+    case WEB_TEXT_DIRECTION_LTR:
+      editor->setBaseWritingDirection(WebCore::LeftToRightWritingDirection);
+      break;
+
+    case WEB_TEXT_DIRECTION_RTL:
+      editor->setBaseWritingDirection(WebCore::RightToLeftWritingDirection);
+      break;
+
+    default:
+      NOTIMPLEMENTED();
+      break;
+  }
+}
+
 void WebViewImpl::RestoreFocus() {
   if (last_focused_frame_.get()) {
     if (last_focused_frame_->page()) {