[LayoutNG] Allow block-flow layout to be fragmented using new approach.

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"
 #include "core/layout/ng/ng_units.h"
 #include "core/layout/ng/ng_writing_mode.h"
@@ skipping 86 matching lines @@
 CORE_EXPORT LayoutUnit ResolveUsedColumnInlineSize(LayoutUnit available_size,
                                                    const ComputedStyle&);
 
 CORE_EXPORT LayoutUnit ResolveUsedColumnGap(const ComputedStyle&);
 
 CORE_EXPORT NGBoxStrut ComputeMargins(const NGConstraintSpace&,
                                       const ComputedStyle&,
                                       const NGWritingMode writing_mode,
                                       const TextDirection direction);
 
-CORE_EXPORT NGBoxStrut ComputeBorders(const ComputedStyle&);
+CORE_EXPORT NGBoxStrut ComputeBorders(const NGConstraintSpace& constraint_space,
+                                      const ComputedStyle&);
 
 CORE_EXPORT NGBoxStrut ComputePadding(const NGConstraintSpace&,
                                       const ComputedStyle&);
 
 // Resolves margin: auto in the inline direction.
 // This uses the available size from the constraint space and inline size to
 // compute the margins that are auto, if any, and adjusts
 // the given NGBoxStrut accordingly.
 CORE_EXPORT void ApplyAutoMargins(const NGConstraintSpace&,
                                   const ComputedStyle&,
                                   const LayoutUnit& inline_size,
                                   NGBoxStrut* margins);
 
 CORE_EXPORT LayoutUnit ConstrainByMinMax(LayoutUnit length,
                                          Optional<LayoutUnit> min,
                                          Optional<LayoutUnit> max);
 
 }  // namespace blink
 
 #endif  // NGLengthUtils_h