Split StyleSurroundData::offset into separate members.

third_party/WebKit/Source/core/style/ComputedStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. 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 542 matching lines @@
       m_surround->margin != other.m_surround->margin) {
     // Relative-positioned elements collapse their margins so need a full
     // layout.
     if (hasOutOfFlowPosition())
       diff.setNeedsPositionedMovementLayout();
     else
       diff.setNeedsFullLayout();
   }
 
   if (!diff.needsFullLayout() && position() != EPosition::kStatic &&
-      m_surround->offset != other.m_surround->offset) {
+      !offsetEqual(other)) {
     // Optimize for the case where a positioned layer is moving but not changing
     // size.
     if (dependenceOnContentHeightHasChanged(*this, other))
       diff.setNeedsFullLayout();
     else
       diff.setNeedsPositionedMovementLayout();
   }
 
   if (diffNeedsPaintInvalidationSubtree(other))
     diff.setNeedsPaintInvalidationSubtree();
@@ skipping 28 matching lines @@
     if (m_box->width() != other.m_box->width() ||
         m_box->minWidth() != other.m_box->minWidth() ||
         m_box->maxWidth() != other.m_box->maxWidth() ||
         m_box->height() != other.m_box->height() ||
         m_box->minHeight() != other.m_box->minHeight() ||
         m_box->maxHeight() != other.m_box->maxHeight())
       return true;
   }
 
   if (m_surround.get() != other.m_surround.get()) {
-    if (m_surround->margin != other.m_surround->margin ||
-        m_surround->offset != other.m_surround->offset ||
+    if (m_surround->margin != other.m_surround->margin || !offsetEqual(other) ||
         m_surround->padding != other.m_surround->padding)
       return true;
   }
 
   if (diff.transformChanged())
     return true;
 
   return false;
 }
 
@@ skipping 1847 matching lines @@
     if (value < 0)
       fvalue -= 0.5f;
     else
       fvalue += 0.5f;
   }
 
   return roundForImpreciseConversion<int>(fvalue / zoomFactor);
 }
 
 }  // namespace blink