[css-grid] Implied minimum size only applies if overflow is visible

third_party/WebKit/Source/core/layout/LayoutGrid.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1224 matching lines @@
 LayoutUnit LayoutGrid::minSizeForChild(LayoutBox& child,
                                        GridTrackSizingDirection direction,
                                        GridSizingData& sizingData) const {
   GridTrackSizingDirection childInlineDirection =
       flowAwareDirectionForChild(child, ForColumns);
   bool isRowAxis = direction == childInlineDirection;
   const Length& childSize = isRowAxis ? child.styleRef().logicalWidth()
                                       : child.styleRef().logicalHeight();
   const Length& childMinSize = isRowAxis ? child.styleRef().logicalMinWidth()
                                          : child.styleRef().logicalMinHeight();
-  if (!childSize.isAuto() || childMinSize.isAuto())
+  bool overflowIsVisible =
+      isRowAxis ? child.styleRef().overflowInlineDirection() == OverflowVisible
+                : child.styleRef().overflowBlockDirection() == OverflowVisible;
+  if (!childSize.isAuto() || (childMinSize.isAuto() && overflowIsVisible))
     return minContentForChild(child, direction, sizingData);
 
   bool overrideSizeHasChanged =
       updateOverrideContainingBlockContentSizeForChild(
           child, childInlineDirection, sizingData);
   if (isRowAxis) {
     LayoutUnit marginLogicalWidth =
         sizingData.sizingOperation == TrackSizing
             ? computeMarginLogicalSizeForChild(InlineDirection, child)
             : marginIntrinsicLogicalWidthForChild(child);
@@ skipping 2250 matching lines @@
   // not stored in m_grid).
   if (direction == ForRows)
     return m_grid.numRows();
 
   return m_grid.numRows() ? m_grid.numColumns()
                           : GridPositionsResolver::explicitGridColumnCount(
                                 styleRef(), m_autoRepeatColumns);
 }
 
 }  // namespace blink