[css-flexbox] childIntrinsicWidth needs to actually return the intrinsic width

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

Index: third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
index 7e2becde31d1c2cfad97cc4ed0bdaad29c3d9942..a6a1db68676a4229937e685667849be1d328e084 100644
--- a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
@@ -476,7 +476,10 @@ LayoutUnit LayoutFlexibleBox::childIntrinsicWidth(const LayoutBox& child) const
 {
     if (!child.isHorizontalWritingMode() && needToStretchChildLogicalHeight(child))
         return constrainedChildIntrinsicContentLogicalHeight(child);
-    // TOOO(cbiesinger): should this return the maxPreferredLogicalWidth?
+    if (child.isHorizontalWritingMode() && child.styleRef().width().isAuto()) {
+        // This value is already clamped by min/max-width
+        return child.maxPreferredLogicalWidth();
+    }
     return child.size().width();
 }