Consider text alignment and direction when computing the left offset for horizontal writing modes.

Source/core/rendering/RenderObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 3246 matching lines @@
 
 PositionWithAffinity RenderObject::createPositionWithAffinity(const Position& position)
 {
     if (position.isNotNull())
         return PositionWithAffinity(position);
 
     ASSERT(!node());
     return createPositionWithAffinity(0, DOWNSTREAM);
 }
 
+ETextAlign RenderObject::simplifiedTextAlign(const ETextAlign& textAlign, const RootInlineBox* rootInlineBox) const
+{
+    TextDirection direction;
+    if (rootInlineBox && rootInlineBox->renderer()->style()->unicodeBidi() == Plaintext)
+        direction = rootInlineBox->direction();
+    else
+        direction = style()->direction();
+
+    bool isLTR = isLeftToRightDirection(direction);
+
+    switch (textAlign) {
+    case LEFT:
+    case WEBKIT_LEFT:
+        return LEFT;
+    case RIGHT:
+    case WEBKIT_RIGHT:
+        return RIGHT;
+    case CENTER:
+    case WEBKIT_CENTER:
+        return CENTER;
+    case TASTART:
+        return isLTR ? LEFT : RIGHT;
+    case TAEND:
+        return isLTR ? RIGHT : LEFT;
+    default:
+        break;
+    }
+
+    // The point of this method is to return only LEFT, RIGHT, CENTER or
+    // JUSTIFY, so we can only return JUSTIFY if this point is reached.
+    return JUSTIFY;
+}
+
 CursorDirective RenderObject::getCursor(const LayoutPoint&, Cursor&) const
 {
     return SetCursorBasedOnStyle;
 }
 
 bool RenderObject::canUpdateSelectionOnRootLineBoxes()
 {
     if (needsLayout())
         return false;
 
@@ skipping 89 matching lines @@
 {
     if (object1) {
         const WebCore::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif