[layoutng] Add methods to compute border and padding

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NGLengthUtils_h
 #define NGLengthUtils_h
 
 #include "core/CoreExport.h"
 
 namespace blink {
@@ skipping 29 matching lines @@
 // Resolves the given length to a layout unit, constraining it by the min
 // logical height and max logical height properties from the ComputedStyle
 // object.
 CORE_EXPORT LayoutUnit computeBlockSizeForFragment(const NGConstraintSpace&,
                                                    const ComputedStyle&,
                                                    LayoutUnit contentSize);
 
 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