Do not collapse margins with padding/border b/w parent and first/last child

third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.h

Index: third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.h b/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.h
index 924bf4accf411e00a5ff63245bf5c444e3aeb7f2..e4d1d5f1b60c7867fed493f351050988b2368cad 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.h
@@ -50,10 +50,12 @@ class CORE_EXPORT NGBlockLayoutAlgorithm : public NGLayoutAlgorithm {
   // fragment's MarginStrut if needed.
   // See https://www.w3.org/TR/CSS2/box.html#collapsing-margins
   //
+  // @param space Constraint space for the block.
   // @param child_margins Margins information for the current child.
   // @param children_margin_strut MarginStrut for children of the current child.
   // @return Margin block start based on collapsed margins result.
-  LayoutUnit CollapseMargins(const NGBoxStrut& child_margins,
+  LayoutUnit CollapseMargins(const NGConstraintSpace& space,
+                             const NGBoxStrut& child_margins,
                              const NGMarginStrut& children_margin_strut);
 
   RefPtr<const ComputedStyle> style_;