Flexbox: Allow intrinsic aspect ratios to inform main-size calculation

Source/core/rendering/RenderFlexibleBox.cpp

Index: Source/core/rendering/RenderFlexibleBox.cpp
diff --git a/Source/core/rendering/RenderFlexibleBox.cpp b/Source/core/rendering/RenderFlexibleBox.cpp
index 6114d5654cd0fe113c50d191fd0a018597dff66b..b7c62fc7285aeb7e34c2825a94cd4361c786b4c8 100644
--- a/Source/core/rendering/RenderFlexibleBox.cpp
+++ b/Source/core/rendering/RenderFlexibleBox.cpp
@@ -631,11 +631,22 @@ bool RenderFlexibleBox::childPreferredMainAxisContentExtentRequiresLayout(Render
     return preferredMainAxisExtentDependsOnLayout(flexBasisForChild(child), hasInfiniteLineLength) && hasOrthogonalFlow(child);
 }
 
+bool RenderFlexibleBox::childHasFiniteCrossSize(RenderBox* child) const
+{
+    if (child->style()->logicalHeight().isAuto())
+        return false;
+    if (child->style()->logicalHeight().isPercent() && !style()->logicalHeight().isFixed())
+        return false;
+    return true;
+}
+
 LayoutUnit RenderFlexibleBox::preferredMainAxisContentExtentForChild(RenderBox* child, bool hasInfiniteLineLength, bool relayoutChildren)
 {
     child->clearOverrideSize();
 
     Length flexBasis = flexBasisForChild(child);
+    if (child->style()->hasAspectRatio() && flexBasis.isAuto() && childHasFiniteCrossSize(child))
+        return child->style()->aspectRatio() * crossAxisIntrinsicExtentForChild(child);
     if (preferredMainAxisExtentDependsOnLayout(flexBasis, hasInfiniteLineLength)) {
         LayoutUnit mainAxisExtent;
         if (hasOrthogonalFlow(child)) {