LayoutState doesn't need to store both layout and pagination offset.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 5241 matching lines @@
   ASSERT(beforeChild->parent() == this);
   return beforeChild;
 }
 
 LayoutUnit LayoutBox::offsetFromLogicalTopOfFirstPage() const {
   LayoutState* layoutState = view()->layoutState();
   if (!layoutState || !layoutState->isPaginated())
     return LayoutUnit();
 
   if (layoutState->layoutObject() == this) {
-    LayoutSize offsetDelta =
-        layoutState->layoutOffset() - layoutState->pageOffset();
-    return isHorizontalWritingMode() ? offsetDelta.height()
-                                     : offsetDelta.width();
+    LayoutSize offset = layoutState->paginationOffset();
+    return isHorizontalWritingMode() ? offset.height() : offset.width();
   }
 
   // A LayoutBlock always establishes a layout state, and this method is only
   // meant to be called on the object currently being laid out.
   ASSERT(!isLayoutBlock());
 
   // In case this box doesn't establish a layout state, try the containing
   // block.
   LayoutBlock* containerBlock = containingBlock();
   ASSERT(layoutState->layoutObject() == containerBlock);
@@ skipping 310 matching lines @@
   LayoutRect rect = frameRect();
 
   LayoutBlock* block = containingBlock();
   if (block)
     block->adjustChildDebugRect(rect);
 
   return rect;
 }
 
 }  // namespace blink