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

third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 278 matching lines @@
     }
 
     // The 'auto' keyword computes to:
     //  - 'stretch' for flex containers and grid containers,
     //  - 'start' for everything else.
     if (style.alignItemsPosition() == ItemPositionAuto) {
         if (isFlexOrGrid)
             style.setAlignItemsPosition(ItemPositionStretch);
     }
 
-    // The 'auto' keyword computes to 'stretch' on absolutely-positioned elements,
-    // and to the computed value of align-items on the parent (minus
-    // any 'legacy' keywords) on all other boxes.
-    if (style.alignSelfPosition() == ItemPositionAuto) {
-        if (absolutePositioned)
-            style.setAlignSelfPosition(ItemPositionStretch);
-        else
-            style.setAlignSelf(parentStyle.alignItems());
-    }
-
     // Block Containers: For table cells, the behavior of the 'auto' depends on the computed
     // value of 'vertical-align', otherwise behaves as 'start'.
     // Flex Containers: 'auto' computes to 'flex-start'.
     // Grid Containers: 'auto' computes to 'start', and 'stretch' behaves like 'start'.
     if ((style.justifyContentPosition() == ContentPositionAuto) && (style.justifyContentDistribution() == ContentDistributionDefault)) {
         if (style.isDisplayFlexibleOrGridBox()) {
             if (style.isDisplayFlexibleBox())
                 style.setJustifyContentPosition(ContentPositionFlexStart);
             else
                 style.setJustifyContentPosition(ContentPositionStart);
@@ skipping 164 matching lines @@
         // We want to count vertical percentage paddings/margins on flex items because our current
         // behavior is different from the spec and we want to gather compatibility data.
         if (style.paddingBefore().hasPercent() || style.paddingAfter().hasPercent())
             UseCounter::count(document, UseCounter::FlexboxPercentagePaddingVertical);
         if (style.marginBefore().hasPercent() || style.marginAfter().hasPercent())
             UseCounter::count(document, UseCounter::FlexboxPercentageMarginVertical);
     }
 }
 
 }