Introduce LayoutBox::paginationBreakability().

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 1201 matching lines @@
         }
 
         if (!positionedObject->normalChildNeedsLayout() && (relayoutChildren || needsLayoutDueToStaticPosition(positionedObject)))
             layoutScope.setChildNeedsLayout(positionedObject);
 
         // If relayoutChildren is set and the child has percentage padding or an embedded content box, we also need to invalidate the childs pref widths.
         if (relayoutChildren && positionedObject->needsPreferredWidthsRecalculation())
             positionedObject->setPreferredLogicalWidthsDirty(MarkOnlyThis);
 
         LayoutUnit logicalTopEstimate;
-        bool needsBlockDirectionLocationSetBeforeLayout = isPaginated && !positionedObject->isUnsplittableForPagination();
+        bool needsBlockDirectionLocationSetBeforeLayout = isPaginated && positionedObject->paginationBreakability() != ForbidBreaks;
         if (needsBlockDirectionLocationSetBeforeLayout) {
             // Out-of-flow objects are normally positioned after layout (while in-flow objects are
             // positioned before layout). If the child object is paginated in the same context as
             // we are, estimate its logical top now. We need to know this up-front, to correctly
             // evaluate if we need to mark for relayout, and, if our estimate is correct, we'll
             // even be able to insert correct pagination struts on the first attempt.
             LogicalExtentComputedValues computedValues;
             positionedObject->computeLogicalHeight(positionedObject->logicalHeight(), positionedObject->logicalTop(), computedValues);
             logicalTopEstimate = computedValues.m_position;
             positionedObject->setLogicalTop(logicalTopEstimate);
@@ skipping 1655 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