[css-grid] Fix performance regression in grid layout

third_party/WebKit/Source/core/css/ComputedStyleCSSValueMapping.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ skipping 701 matching lines @@
     const Length& trackBreadthLength = trackBreadth.length();
     if (trackBreadthLength.isAuto())
         return CSSPrimitiveValue::createIdentifier(CSSValueAuto);
     return zoomAdjustedPixelValueForLength(trackBreadthLength, style);
 }
 
 static CSSValue* specifiedValueForGridTrackSize(const GridTrackSize& trackSize, const ComputedStyle& style)
 {
     switch (trackSize.type()) {
     case LengthTrackSizing:
-        return specifiedValueForGridTrackBreadth(trackSize.length(), style);
+        return specifiedValueForGridTrackBreadth(trackSize.minTrackBreadth(), style);
     case MinMaxTrackSizing: {
         auto* minMaxTrackBreadths = CSSFunctionValue::create(CSSValueMinmax);
         minMaxTrackBreadths->append(*specifiedValueForGridTrackBreadth(trackSize.minTrackBreadth(), style));
         minMaxTrackBreadths->append(*specifiedValueForGridTrackBreadth(trackSize.maxTrackBreadth(), style));
         return minMaxTrackBreadths;
     } case FitContentTrackSizing: {
         auto* fitContentTrackBreadth = CSSFunctionValue::create(CSSValueFitContent);
-        fitContentTrackBreadth->append(*specifiedValueForGridTrackBreadth(trackSize.length(), style));
+        fitContentTrackBreadth->append(*specifiedValueForGridTrackBreadth(trackSize.fitContentTrackBreadth(), style));
         return fitContentTrackBreadth;
     }
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 class OrderedNamedLinesCollector {
     STACK_ALLOCATED();
     WTF_MAKE_NONCOPYABLE(OrderedNamedLinesCollector);
@@ skipping 2266 matching lines @@
     case CSSPropertyAll:
         return nullptr;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 } // namespace blink