[layoutng] Add methods to compute border and padding

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

Index: third_party/WebKit/Source/core/layout/ng/ng_length_utils.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_length_utils.h b/third_party/WebKit/Source/core/layout/ng/ng_length_utils.h
index 2491d172911bb4f018adc7798eee59b740785e21..ee849bb8601aca97f0cb9ddc7706b216dacca5ba 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_length_utils.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_length_utils.h
@@ -14,7 +14,12 @@ class Length;
 class NGConstraintSpace;
 struct NGBoxStrut;
 
-enum class LengthResolveType { MinSize, MaxSize, ContentSize, MarginSize };
+enum class LengthResolveType {
+  MinSize,
+  MaxSize,
+  ContentSize,
+  MarginBorderPaddingSize
+};
 
 #define NGSizeIndefinite LayoutUnit(-1)
 
@@ -47,6 +52,11 @@ CORE_EXPORT LayoutUnit computeBlockSizeForFragment(const NGConstraintSpace&,
 CORE_EXPORT NGBoxStrut computeMargins(const NGConstraintSpace&,
                                       const ComputedStyle&);
 
+CORE_EXPORT NGBoxStrut computeBorders(const ComputedStyle&);
+
+CORE_EXPORT NGBoxStrut computePadding(const NGConstraintSpace&,
+                                      const ComputedStyle&);
+
 }  // namespace blink
 
 #endif  // NGLengthUtils_h