[css-grid] Fix percentage height on grid item's children

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 2715 matching lines @@
     LayoutUnit stretchedFlexHeight(-1);
     if (cb->isFlexItem())
         stretchedFlexHeight = toLayoutFlexibleBox(cb->parent())->childLogicalHeightForPercentageResolution(*cb);
 
     if (isHorizontalWritingMode() != cb->isHorizontalWritingMode()) {
         availableHeight = containingBlockChild->containingBlockLogicalWidthForContent();
     } else if (stretchedFlexHeight != LayoutUnit(-1)) {
         availableHeight = stretchedFlexHeight;
     } else if (hasOverrideContainingBlockLogicalHeight() && !isOutOfFlowPositionedWithSpecifiedHeight) {
         availableHeight = overrideContainingBlockContentLogicalHeight();
+    } else if (cb->isGridItem() && cb->hasOverrideLogicalContentHeight()) {
+        availableHeight = cb->overrideLogicalContentHeight();
     } else if (cbstyle.logicalHeight().isFixed()) {
         LayoutUnit contentBoxHeight = cb->adjustContentBoxLogicalHeightForBoxSizing(cbstyle.logicalHeight().value());
         availableHeight = cb->constrainContentBoxLogicalHeightByMinMax(
             contentBoxHeight - cb->scrollbarLogicalHeight(), LayoutUnit(-1)).clampNegativeToZero();
         if (cb->isTableCell()) {
             includeBorderPadding = true;
             // We're sizing content to the height from the cell's style so don't involve the intrinsic padding used to align the content.
             availableHeight -= cb->computedCSSPaddingBefore() + cb->computedCSSPaddingAfter() + cb->borderBefore() + cb->borderAfter();
         }
     } else if (cb->isTableCell()) {
@@ skipping 2129 matching lines @@
         m_rareData->m_snapAreas->remove(&snapArea);
     }
 }
 
 SnapAreaSet* LayoutBox::snapAreas() const
 {
     return m_rareData ? m_rareData->m_snapAreas.get() : nullptr;
 }
 
 } // namespace blink