Need to examine the *bottom* of fragmented content.

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 2639 matching lines @@
     LayoutFlowThread* flowThread = flowThreadContainingBlock();
     if (!flowThread) {
         // If there's no flow thread, we're not nested. All pages have the same height. Give up.
         return strutToNextPage;
     }
     // Start searching for a suitable offset at the top of the next page or column.
     LayoutUnit flowThreadOffset = offsetFromLogicalTopOfFirstPage() + nextPageLogicalTop;
     return strutToNextPage + flowThread->nextLogicalTopForUnbreakableContent(flowThreadOffset, contentLogicalHeight) - flowThreadOffset;
 }
 
-void LayoutBlock::paginatedContentWasLaidOut(LayoutUnit logicalTopOffsetAfterPagination)
+void LayoutBlock::paginatedContentWasLaidOut(LayoutUnit logicalBottomOffsetAfterPagination)
 {
     if (LayoutFlowThread* flowThread = flowThreadContainingBlock())
-        flowThread->contentWasLaidOut(offsetFromLogicalTopOfFirstPage() + logicalTopOffsetAfterPagination);
+        flowThread->contentWasLaidOut(offsetFromLogicalTopOfFirstPage() + logicalBottomOffsetAfterPagination);
 }
 
 LayoutUnit LayoutBlock::collapsedMarginBeforeForChild(const LayoutBox& child) const
 {
     // If the child has the same directionality as we do, then we can just return its
     // collapsed margin.
     if (!child.isWritingModeRoot())
         return child.collapsedMarginBefore();
 
     // The child has a different directionality.  If the child is parallel, then it's just
@@ skipping 221 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