Percent height content should respect the fixed height of its containing cell

Source/core/layout/LayoutBox.cpp

Index: Source/core/layout/LayoutBox.cpp
diff --git a/Source/core/layout/LayoutBox.cpp b/Source/core/layout/LayoutBox.cpp
index 5d9e99c3503e9ad39036aa462f9a9209ad8b2d34..c78e335a7c25d027f62353989a8032c01705905a 100644
--- a/Source/core/layout/LayoutBox.cpp
+++ b/Source/core/layout/LayoutBox.cpp
@@ -2470,6 +2470,14 @@ LayoutUnit LayoutBox::computePercentageLogicalHeight(const Length& height) const
         availableHeight = containingBlockChild->containingBlockLogicalWidthForContent();
     } else if (hasOverrideContainingBlockLogicalHeight()) {
         availableHeight = overrideContainingBlockContentLogicalHeight();
+    } else if (cbstyle.logicalHeight().isFixed()) {
+        LayoutUnit contentBoxHeight = cb->adjustContentBoxLogicalHeightForBoxSizing(cbstyle.logicalHeight().value());
+        availableHeight = std::max(LayoutUnit(), cb->constrainContentBoxLogicalHeightByMinMax(contentBoxHeight - cb->scrollbarLogicalHeight(), -1));
+        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()) {
         if (!skippedAutoHeightContainingBlock) {
             // Table cells violate what the CSS spec says to do with heights. Basically we
@@ -2491,9 +2499,6 @@ LayoutUnit LayoutBox::computePercentageLogicalHeight(const Length& height) const
             availableHeight = cb->overrideLogicalContentHeight();
             includeBorderPadding = true;
         }
-    } else if (cbstyle.logicalHeight().isFixed()) {
-        LayoutUnit contentBoxHeight = cb->adjustContentBoxLogicalHeightForBoxSizing(cbstyle.logicalHeight().value());
-        availableHeight = std::max(LayoutUnit(), cb->constrainContentBoxLogicalHeightByMinMax(contentBoxHeight - cb->scrollbarLogicalHeight(), -1));
     } else if (cbstyle.logicalHeight().isPercent() && !isOutOfFlowPositionedWithSpecifiedHeight) {
         // We need to recur and compute the percentage height for our containing block.
         LayoutUnit heightWithScrollbar = cb->computePercentageLogicalHeight(cbstyle.logicalHeight());
@@ -2526,10 +2531,8 @@ LayoutUnit LayoutBox::computePercentageLogicalHeight(const Length& height) const
 
     LayoutUnit result = valueForLength(height, availableHeight);
     if (includeBorderPadding) {
-        // FIXME: Table cells should default to box-sizing: border-box so we can avoid this hack.
-        // It is necessary to use the border-box to match WinIE's broken
-        // box model. This is essential for sizing inside
-        // table cells using percentage heights.
+        // TODO(rhogan) crbug.com/467378: Doing this for content inside tables cells is wrong, it should fill
+        // whatever height the cell makes available.
         result -= borderAndPaddingLogicalHeight();
         return std::max(LayoutUnit(), result);
     }