Merge 104121 - Source/WebCore: Crash in RenderRegion::getRegionRangeForBox.

Source/WebCore/rendering/RenderFlowThread.h

 /*
  * Copyright 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 71 matching lines @@
     void computeLogicalWidth();
     void computeLogicalHeight();
 
     void paintIntoRegion(PaintInfo&, RenderRegion*, const LayoutPoint& paintOffset);
     bool hitTestRegion(RenderRegion*, const HitTestRequest&, HitTestResult&, const LayoutPoint& pointInContainer, const LayoutPoint& accumulatedOffset);
 
     bool hasRegions() const { return m_regionList.size(); }
     bool hasValidRegions() const { ASSERT(!m_regionsInvalidated); return m_hasValidRegions; }
 
     void invalidateRegions() { m_regionsInvalidated = true; setNeedsLayout(true); }
+    bool hasValidRegionInfo() const { return !m_regionsInvalidated && hasValidRegions(); }
 
     static PassRefPtr<RenderStyle> createFlowThreadStyle(RenderStyle* parentStyle);
 
     void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
 
     void pushDependencies(RenderFlowThreadList&);
 
     void repaintRectangleInRegions(const LayoutRect&, bool immediate);
 
     LayoutUnit regionLogicalWidthForLine(LayoutUnit position) const;
@@ skipping 87 matching lines @@
     ASSERT(!object || object->isRenderFlowThread());
     return static_cast<const RenderFlowThread*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderFlowThread(const RenderFlowThread*);
 
 } // namespace WebCore
 
 #endif // RenderFlowThread_h