Optimize for horizontal writing mode

Source/core/rendering/RenderFlowThread.cpp

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. 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.
@@ skipping 335 matching lines @@
     while (currentBlock && !currentBlock->isRenderFlowThread()) {
         RenderBlock* containerBlock = currentBlock->containingBlock();
         ASSERT(containerBlock);
         if (!containerBlock)
             return 0;
         LayoutPoint currentBlockLocation = currentBlock->location();
 
         if (containerBlock->style()->writingMode() != currentBlock->style()->writingMode()) {
             // We have to put the block rect in container coordinates
             // and we have to take into account both the container and current block flipping modes
-            if (containerBlock->style()->isFlippedBlocksWritingMode()) {
+            if (containerBlock->style()->slowIsFlippedBlocksWritingMode()) {
                 if (containerBlock->isHorizontalWritingMode())
                     blockRect.setY(currentBlock->height() - blockRect.maxY());
                 else
                     blockRect.setX(currentBlock->width() - blockRect.maxX());
             }
             currentBlock->flipForWritingMode(blockRect);
         }
         blockRect.moveBy(currentBlockLocation);
         currentBlock = containerBlock;
     }
@@ skipping 24 matching lines @@
 {
     if (!m_renderFlowThread)
         return;
     RenderView* view = m_renderFlowThread->view();
     ASSERT(view->flowThreadController()->currentRenderFlowThread() == m_renderFlowThread);
     view->flowThreadController()->setCurrentRenderFlowThread(m_previousRenderFlowThread);
 }
 
 
 } // namespace blink