[css-align] Avoid the style Reattach whenever align-items changes.

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

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 348 matching lines @@
     }
 
 public:
     static PassRefPtr<ComputedStyle> create();
     static PassRefPtr<ComputedStyle> createAnonymousStyleWithDisplay(const ComputedStyle& parentStyle, EDisplay);
     static PassRefPtr<ComputedStyle> clone(const ComputedStyle&);
 
     // Computes how the style change should be propagated down the tree.
     static StyleRecalcChange stylePropagationDiff(const ComputedStyle* oldStyle, const ComputedStyle* newStyle);
 
+    const StyleSelfAlignmentData resolvedAlignment(const ComputedStyle& parentStyle, ItemPosition resolvedAutoPositionForLayoutObject) const;
     static ItemPosition resolveAlignment(const ComputedStyle& parentStyle, const ComputedStyle& childStyle, ItemPosition resolvedAutoPositionForLayoutObject);
     static ItemPosition resolveJustification(const ComputedStyle& parentStyle, const ComputedStyle& childStyle, ItemPosition resolvedAutoPositionForLayoutObject);
 
     StyleDifference visualInvalidationDiff(const ComputedStyle&) const;
 
     enum IsAtShadowBoundary {
         AtShadowBoundary,
         NotAtShadowBoundary,
     };
 
@@ skipping 1629 matching lines @@
 }
 
 inline bool ComputedStyle::hasPseudoElementStyle() const
 {
     return noninherited_flags.pseudoBits & PSEUDO_ELEMENT_MASK;
 }
 
 } // namespace blink
 
 #endif // ComputedStyle_h