Let positionNewFloats() take a logicalTop parameter.

third_party/WebKit/Source/core/layout/line/LineBreaker.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
  *               All right reserved.
  * Copyright (C) 2010 Google 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 25 matching lines @@
     if (lineLayoutItem.isOutOfFlowPositioned()) {
       setStaticPositions(m_block, LineLayoutBox(lineLayoutItem),
                          width.indentText());
       if (lineLayoutItem.style()->isOriginalDisplayInlineType()) {
         resolver.runs().addRun(
             createRun(0, 1, LineLayoutItem(lineLayoutItem), resolver));
         lineInfo.incrementRunsFromLeadingWhitespace();
       }
     } else if (lineLayoutItem.isFloating()) {
       m_block.insertFloatingObject(LineLayoutBox(lineLayoutItem));
-      m_block.positionNewFloats(&width);
+      m_block.positionNewFloats(m_block.logicalHeight(), &width);
     }
     resolver.position().increment(&resolver);
   }
   resolver.commitExplicitEmbedding(resolver.runs());
 }
 
 void LineBreaker::reset() {
   m_positionedObjects.clear();
   m_hyphenated = false;
   m_clear = ClearNone;
@@ skipping 54 matching lines @@
 
     context.increment();
   }
 
   context.clearLineBreakIfFitsOnLine();
 
   return context.handleEndOfLine();
 }
 
 }  // namespace blink