Implement Paint Containment

third_party/WebKit/Source/core/layout/LayoutBlock.cpp

 /*
  * 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, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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
@@ skipping 990 matching lines @@
 
     IntRect inflatedRect = pixelSnappedBorderBoxRect();
     LayoutTheme::theme().addVisualOverflow(*this, inflatedRect);
     addVisualOverflow(LayoutRect(inflatedRect));
 }
 
 bool LayoutBlock::createsNewFormattingContext() const
 {
     return isInlineBlockOrInlineTable() || isFloatingOrOutOfFlowPositioned() || hasOverflowClip() || isFlexItemIncludingDeprecated()
         || style()->specifiesColumns() || isLayoutFlowThread() || isTableCell() || isTableCaption() || isFieldset() || isWritingModeRoot()
-        || isDocumentElement() || isColumnSpanAll() || isGridItem();
+        || isDocumentElement() || isColumnSpanAll() || isGridItem() || style()->containsPaint();
 }
 
 void LayoutBlock::updateBlockChildDirtyBitsBeforeLayout(bool relayoutChildren, LayoutBox& child)
 {
     if (child.isOutOfFlowPositioned()) {
         // It's rather useless to mark out-of-flow children at this point. We may not be their
         // containing block (and if we are, it's just pure luck), so this would be the wrong place
         // for it. Furthermore, it would cause trouble for out-of-flow descendants of column
         // spanners, if the containing block is outside the spanner but inside the multicol container.
         return;
@@ skipping 1889 matching lines @@
 void LayoutBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const LayoutObject* obj) const
 {
     showLayoutObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink