[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..04b0c41a84b4a8a3c82c43cd171e2f9bf1cf3496 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
@@ -47,6 +47,11 @@ 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