RAL: Eliminate n^2 walk to find repaint containers

Source/core/rendering/RenderView.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 198 matching lines @@
     virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const OVERRIDE;
 
     bool shouldRepaint(const LayoutRect&) const;
 
     bool rootFillsViewportBackground(RenderBox* rootBox) const;
 
     // These functions may only be accessed by LayoutStateMaintainer.
     bool pushLayoutState(RenderBox& renderer, const LayoutSize& offset, LayoutUnit pageHeight = 0, bool pageHeightChanged = false, ColumnInfo* colInfo = 0)
     {
         // We push LayoutState even if layoutState is disabled because it stores layoutDelta too.
-        if ((!doingFullRepaint() || RuntimeEnabledFeatures::repaintAfterLayoutEnabled()) || m_layoutState->isPaginated() || renderer.hasColumns() || renderer.flowThreadContainingBlock()
+        if ((!doingFullRepaint() || (RuntimeEnabledFeatures::repaintAfterLayoutEnabled() && layoutStateEnabled())) || m_layoutState->isPaginated() || renderer.hasColumns() || renderer.flowThreadContainingBlock()
             ) {
             pushLayoutStateForCurrentFlowThread(renderer);
             m_layoutState = new LayoutState(m_layoutState, renderer, offset, pageHeight, pageHeightChanged, colInfo);
             return true;
         }
         return false;
     }
 
     void layoutContent();
 #ifndef NDEBUG
@@ skipping 144 matching lines @@
     {
         m_view.enableLayoutState();
     }
 private:
     RenderView& m_view;
 };
 
 } // namespace WebCore
 
 #endif // RenderView_h