[css-grid] Implement fit-content track size

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 702 matching lines @@
     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);
-    case MinMaxTrackSizing:
-        CSSFunctionValue* minMaxTrackBreadths = CSSFunctionValue::create(CSSValueMinmax);
+    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));
+        return fitContentTrackBreadth;
+    }
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 class OrderedNamedLinesCollector {
     STACK_ALLOCATED();
     WTF_MAKE_NONCOPYABLE(OrderedNamedLinesCollector);
 public:
     OrderedNamedLinesCollector(const ComputedStyle& style, bool isRowAxis, size_t autoRepeatTracksCount)
@@ skipping 2264 matching lines @@
     case CSSPropertyAll:
         return nullptr;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 } // namespace blink