Top down version of algorithm to position margins and floats in LayoutNG

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

Index: third_party/WebKit/Source/core/layout/ng/ng_units.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_units.h b/third_party/WebKit/Source/core/layout/ng/ng_units.h
index f2a5972ad045506ea1c6e327c37fc7f977d8f66c..0304b910ce93db98a0efaf3d9f3f920b59845076 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_units.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_units.h
@@ -303,39 +303,18 @@ inline std::ostream& operator<<(std::ostream& stream, const NGBoxStrut& value) {
 }
 
 // This struct is used for the margin collapsing calculation.
-// TODO(glebl): Deprecated. It's being replaced by NGMarginStrut
-struct CORE_EXPORT NGDeprecatedMarginStrut {
-  LayoutUnit margin_block_start;
-  LayoutUnit margin_block_end;
-
-  LayoutUnit negative_margin_block_start;
-  LayoutUnit negative_margin_block_end;
-
-  LayoutUnit BlockEndSum() const;
-
-  void AppendMarginBlockStart(const LayoutUnit& value);
-  void AppendMarginBlockEnd(const LayoutUnit& value);
-  void SetMarginBlockStart(const LayoutUnit& value);
-  void SetMarginBlockEnd(const LayoutUnit& value);
-
-  bool IsEmpty() const;
-
-  String ToString() const;
-
-  bool operator==(const NGDeprecatedMarginStrut& other) const;
-};
-
-// This struct is used for the margin collapsing calculation.
 struct CORE_EXPORT NGMarginStrut {
   LayoutUnit margin;
   LayoutUnit negative_margin;
 
-  bool operator==(const NGMarginStrut& other) const;
-
+  // Appends negative or positive value to the current margin strut.
   void Append(const LayoutUnit& value);
 
+  // Collapses positive and negative margins producing a sum of them.
   LayoutUnit Collapse() const;
 
+  bool operator==(const NGMarginStrut& other) const;
+
   String ToString() const;
 };