Avoid unnecessary relayout of floats when not paginated.

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 1077 matching lines @@
   virtual int inlineBlockBaseline(LineDirectionMode) const {
     return -1;
   }  // Returns -1 if we should skip this box when computing the baseline of an
      // inline-block.
 
   virtual Node* nodeForHitTest() const { return node(); }
 
   bool shrinkToAvoidFloats() const;
   virtual bool avoidsFloats() const;
 
-  void updateFragmentationInfoForChild(LayoutBox& child);
-
-  void markChildForPaginationRelayoutIfNeeded(LayoutBox& child,
-                                              SubtreeLayoutScope&);
+  void updateFragmentationInfoForChild(LayoutBox&);
+  bool childNeedsRelayoutForPagination(const LayoutBox&) const;
+  void markChildForPaginationRelayoutIfNeeded(LayoutBox&, SubtreeLayoutScope&);
 
   bool isWritingModeRoot() const {
     return !parent() ||
            parent()->style()->getWritingMode() != style()->getWritingMode();
   }
   bool isOrthogonalWritingModeRoot() const {
     return parent() &&
            parent()->isHorizontalWritingMode() != isHorizontalWritingMode();
   }
   void markOrthogonalWritingModeRoot();
@@ skipping 508 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