Paint flex items atomically, like inline-blocks

Source/core/rendering/RenderBlock.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * 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.
@@ skipping 436 matching lines @@
     void setShapeInsideInfo(PassOwnPtr<ShapeInsideInfo> value)
     {
         if (!m_rareData)
             m_rareData = adoptPtr(new RenderBlockRareData(this));
         m_rareData->m_shapeInsideInfo = value;
     }
     ShapeInsideInfo* layoutShapeInsideInfo() const;
     bool allowsShapeInsideInfoSharing() const { return !isInline() && !isFloating(); }
     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) OVERRIDE;
 
+    // inline-block elements paint all phases atomically. This function ensures that. Certain other elements
+    // (grid items, flex items) require this behavior as well, and this function exists as a helper for them.
+    // It is expected that the caller will call this function independent of the value of paintInfo.phase.
+    static void paintAsInlineBlock(RenderObject*, PaintInfo&, const LayoutPoint&);
 protected:
     virtual void willBeDestroyed();
 
     LayoutUnit maxPositiveMarginBefore() const { return m_rareData ? m_rareData->m_margins.positiveMarginBefore() : RenderBlockRareData::positiveMarginBeforeDefault(this); }
     LayoutUnit maxNegativeMarginBefore() const { return m_rareData ? m_rareData->m_margins.negativeMarginBefore() : RenderBlockRareData::negativeMarginBeforeDefault(this); }
     LayoutUnit maxPositiveMarginAfter() const { return m_rareData ? m_rareData->m_margins.positiveMarginAfter() : RenderBlockRareData::positiveMarginAfterDefault(this); }
     LayoutUnit maxNegativeMarginAfter() const { return m_rareData ? m_rareData->m_margins.negativeMarginAfter() : RenderBlockRareData::negativeMarginAfterDefault(this); }
 
     void setMaxMarginBeforeValues(LayoutUnit pos, LayoutUnit neg);
     void setMaxMarginAfterValues(LayoutUnit pos, LayoutUnit neg);
@@ skipping 24 matching lines @@
 
     virtual void layout();
 
     void layoutPositionedObjects(bool relayoutChildren, bool fixedPositionObjectsOnly = false);
     void markFixedPositionObjectForLayoutIfNeeded(RenderObject* child, SubtreeLayoutScope&);
 
     virtual void paint(PaintInfo&, const LayoutPoint&);
     virtual void paintObject(PaintInfo&, const LayoutPoint&);
     virtual void paintChildren(PaintInfo&, const LayoutPoint&);
     void paintChild(RenderBox*, PaintInfo&, const LayoutPoint&);
+    void paintChildAsInlineBlock(RenderBox*, PaintInfo&, const LayoutPoint&);
 
     LayoutUnit logicalRightOffsetForLine(LayoutUnit logicalTop, LayoutUnit fixedOffset, bool applyTextIndent, LayoutUnit* heightRemaining = 0, LayoutUnit logicalHeight = 0) const
     {
         return adjustLogicalRightOffsetForLine(logicalRightFloatOffsetForLine(logicalTop, fixedOffset, heightRemaining, logicalHeight, ShapeOutsideFloatShapeOffset), applyTextIndent);
     }
     LayoutUnit logicalLeftOffsetForLine(LayoutUnit logicalTop, LayoutUnit fixedOffset, bool applyTextIndent, LayoutUnit* heightRemaining = 0, LayoutUnit logicalHeight = 0) const
     {
         return adjustLogicalLeftOffsetForLine(logicalLeftFloatOffsetForLine(logicalTop, fixedOffset, heightRemaining, logicalHeight, ShapeOutsideFloatShapeOffset), applyTextIndent);
     }
     LayoutUnit logicalRightOffsetForLineIgnoringShapeOutside(LayoutUnit logicalTop, LayoutUnit fixedOffset, bool applyTextIndent, LayoutUnit* heightRemaining = 0, LayoutUnit logicalHeight = 0) const
@@ skipping 583 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderBlock());
     return static_cast<const RenderBlock*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderBlock(const RenderBlock*);
 
 } // namespace WebCore
 
 #endif // RenderBlock_h