Optimize for horizontal writing mode

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 1945 matching lines @@
     if (paintInvalidationContainer == this)
         return;
 
     RenderObject* o = parent();
     if (!o)
         return;
 
     // FIXME: this should call offsetFromContainer to share code, but I'm not sure it's ever called.
     LayoutPoint centerPoint = roundedLayoutPoint(transformState.mappedPoint());
     if (mode & ApplyContainerFlip && o->isBox()) {
-        if (o->style()->isFlippedBlocksWritingMode())
+        if (o->style()->slowIsFlippedBlocksWritingMode())
             transformState.move(toRenderBox(o)->flipForWritingModeIncludingColumns(roundedLayoutPoint(transformState.mappedPoint())) - centerPoint);
         mode &= ~ApplyContainerFlip;
     }
 
     transformState.move(o->columnOffset(roundedLayoutPoint(transformState.mappedPoint())));
 
     if (o->hasOverflowClip())
         transformState.move(-toRenderBox(o)->scrolledContentOffset());
 
     o->mapLocalToContainer(paintInvalidationContainer, transformState, mode, wasFixed, paintInvalidationState);
@@ skipping 1164 matching lines @@
 {
     if (object1) {
         const blink::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif