[css-grid] Implement repeat(auto-fit)

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 818 matching lines @@
 
     if (trackListIsEmpty)
         return CSSPrimitiveValue::createIdentifier(CSSValueNone);
 
     size_t repetitions = isLayoutGrid ? toLayoutGrid(layoutObject)->autoRepeatCountForDirection(direction) : 0;
     OrderedNamedLinesCollector collector(style, isRowAxis, repetitions);
     CSSValueList* list = CSSValueList::createSpaceSeparated();
     size_t insertionIndex;
     if (isLayoutGrid) {
         const auto* grid = toLayoutGrid(layoutObject);
-        const Vector<LayoutUnit>& trackPositions = direction == ForColumns ? grid->columnPositions() : grid->rowPositions();
-        // There are at least #tracks + 1 grid lines (trackPositions). Apart from that, the grid container can generate implicit grid tracks,
-        // so we'll have more trackPositions than trackSizes as the latter only contain the explicit grid.
-        ASSERT(trackPositions.size() - 1 >= trackSizes.size());
+        Vector<LayoutUnit> computedTrackSizes = grid->trackSizesForComputedStyle(direction);
+        size_t numTracks = computedTrackSizes.size();
 
-        size_t i;
-        LayoutUnit gutterSize = grid->guttersSize(direction, 2);
-        LayoutUnit offsetBetweenTracks = grid->offsetBetweenTracks(direction);
-        for (i = 0; i < trackPositions.size() - 2; ++i) {
+        for (size_t i = 0; i < numTracks; ++i) {
             addValuesForNamedGridLinesAtIndex(collector, i, *list);
-            list->append(*zoomAdjustedPixelValue(trackPositions[i + 1] - trackPositions[i] - gutterSize - offsetBetweenTracks, style));
+            list->append(*zoomAdjustedPixelValue(computedTrackSizes[i], style));
         }
-        // Last track line does not have any gutter or distribution offset.
-        addValuesForNamedGridLinesAtIndex(collector, i, *list);
-        list->append(*zoomAdjustedPixelValue(trackPositions[i + 1] - trackPositions[i], style));
-        insertionIndex = trackPositions.size() - 1;
+        addValuesForNamedGridLinesAtIndex(collector, numTracks + 1, *list);
+
+        insertionIndex = numTracks;
     } else {
         for (size_t i = 0; i < trackSizes.size(); ++i) {
             addValuesForNamedGridLinesAtIndex(collector, i, *list);
             list->append(*specifiedValueForGridTrackSize(trackSizes[i], style));
         }
         insertionIndex = trackSizes.size();
     }
     // Those are the trailing <string>* allowed in the syntax.
     addValuesForNamedGridLinesAtIndex(collector, insertionIndex, *list);
     return list;
@@ skipping 2138 matching lines @@
     case CSSPropertyAll:
         return nullptr;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 } // namespace blink