[LayoutNG] Add floats_bfc_offset to constraint space.

third_party/WebKit/Source/core/layout/ng/ng_constraint_space_builder.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 NGConstraintSpaceBuilder_h
 #define NGConstraintSpaceBuilder_h
 
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_unpositioned_float.h"
 #include "platform/wtf/Allocator.h"
@@ skipping 35 matching lines @@
 
   NGConstraintSpaceBuilder& SetFragmentationType(NGFragmentationType);
   NGConstraintSpaceBuilder& SetIsNewFormattingContext(bool is_new_fc);
   NGConstraintSpaceBuilder& SetIsAnonymous(bool is_anonymous);
 
   NGConstraintSpaceBuilder& SetUnpositionedFloats(
       Vector<RefPtr<NGUnpositionedFloat>>& unpositioned_floats);
 
   NGConstraintSpaceBuilder& SetMarginStrut(const NGMarginStrut& margin_strut);
 
-  NGConstraintSpaceBuilder& SetBfcOffset(const NGLogicalOffset& offset);
+  NGConstraintSpaceBuilder& SetBfcOffset(const NGLogicalOffset& bfc_offset);
+  NGConstraintSpaceBuilder& SetFloatsBfcOffset(
+      const WTF::Optional<NGLogicalOffset>& floats_bfc_offset);
 
   NGConstraintSpaceBuilder& SetClearanceOffset(
       const WTF::Optional<LayoutUnit>& clearance_offset);
 
   // Creates a new constraint space. This may be called multiple times, for
   // example the constraint space will be different for a child which:
   //  - Establishes a new formatting context.
   //  - Is within a fragmentation container and needs its fragmentation offset
   //    updated.
   //  - Has its size is determined by its parent layout (flex, abs-pos).
@@ skipping 15 matching lines @@
   unsigned is_shrink_to_fit_ : 1;
   unsigned is_inline_direction_triggers_scrollbar_ : 1;
   unsigned is_block_direction_triggers_scrollbar_ : 1;
   unsigned fragmentation_type_ : 2;
   unsigned is_new_fc_ : 1;
   unsigned is_anonymous_ : 1;
   unsigned text_direction_ : 1;
 
   NGMarginStrut margin_strut_;
   NGLogicalOffset bfc_offset_;
+  WTF::Optional<NGLogicalOffset> floats_bfc_offset_;
   std::shared_ptr<NGExclusions> exclusions_;
   WTF::Optional<LayoutUnit> clearance_offset_;
   Vector<RefPtr<NGUnpositionedFloat>> unpositioned_floats_;
 };
 
 }  // namespace blink
 
 #endif  // NGConstraintSpaceBuilder