Better isPageLogicalHeightKnown() implementation.

third_party/WebKit/Source/core/layout/LayoutBox.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007 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 761 matching lines @@
   // is returned.
   LayoutUnit offsetToNextPage() const {
     return m_rareData ? m_rareData->m_offsetToNextPage : LayoutUnit();
   }
   void setOffsetToNextPage(LayoutUnit);
 
   // Specify which page or column to associate with an offset, if said offset is
   // exactly at a page or column boundary.
   enum PageBoundaryRule { AssociateWithFormerPage, AssociateWithLatterPage };
   LayoutUnit pageLogicalHeightForOffset(LayoutUnit) const;
+  bool isPageLogicalHeightKnown() const;
   LayoutUnit pageRemainingLogicalHeightForOffset(LayoutUnit,
                                                  PageBoundaryRule) const;
 
   bool crossesPageBoundary(LayoutUnit offset, LayoutUnit logicalHeight) const;
 
   // Calculate the strut to insert in order fit content of size
   // |contentLogicalHeight|. |strutToNextPage| is the strut to add to |offset|
   // to merely get to the top of the next page or column. This is what will be
   // returned if the content can actually fit there. Otherwise, return the
   // distance to the next fragmentainer that can fit this piece of content.
@@ skipping 830 matching lines @@
 
 inline bool LayoutBox::isForcedFragmentainerBreakValue(EBreak breakValue) {
   return breakValue == BreakColumn || breakValue == BreakLeft ||
          breakValue == BreakPage || breakValue == BreakRecto ||
          breakValue == BreakRight || breakValue == BreakVerso;
 }
 
 }  // namespace blink
 
 #endif  // LayoutBox_h