Optimize for horizontal writing mode

Source/core/rendering/RenderBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2156 matching lines @@
     if (!m_floatingObjects)
         return;
 
     markSiblingsWithFloatsForLayout();
 
     m_floatingObjects->clear();
 }
 
 LayoutPoint RenderBlockFlow::flipFloatForWritingModeForChild(const FloatingObject* child, const LayoutPoint& point) const
 {
-    if (!style()->isFlippedBlocksWritingMode())
+    if (!style()->slowIsFlippedBlocksWritingMode())
         return point;
 
     // This is similar to RenderBox::flipForWritingModeForChild. We have to subtract out our left/top offsets twice, since
     // it's going to get added back in. We hide this complication here so that the calling code looks normal for the unflipped
     // case.
     if (isHorizontalWritingMode())
         return LayoutPoint(point.x(), point.y() + height() - child->renderer()->height() - 2 * yPositionForFloatIncludingMargin(child));
     return LayoutPoint(point.x() + width() - child->renderer()->width() - 2 * xPositionForFloatIncludingMargin(child), point.y());
 }
 
@@ skipping 670 matching lines @@
     FrameView* frameView = document().view();
     LayoutUnit top = (style()->position() == FixedPosition) ? 0 : frameView->scrollOffset().height();
     int visibleHeight = frameView->visibleContentRect(IncludeScrollbars).height();
     if (height() < visibleHeight)
         top += (visibleHeight - height()) / 2;
     setY(top);
     dialog->setCentered(top);
 }
 
 } // namespace blink