Add ClearanceOffset to LayoutNG Constraint space.

third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.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 NGBlockLayoutAlgorithm_h
 #define NGBlockLayoutAlgorithm_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_block_node.h"
 #include "core/layout/ng/ng_break_token.h"
@@ skipping 22 matching lines @@
   //              fragment within.
   // @param break_token The break token from which the layout should start.
   NGBlockLayoutAlgorithm(NGBlockNode* node,
                          NGConstraintSpace* space,
                          NGBreakToken* break_token = nullptr);
 
   Optional<MinAndMaxContentSizes> ComputeMinAndMaxContentSizes() const override;
   RefPtr<NGPhysicalFragment> Layout() override;
 
  private:
+  // Updates the fragment's BFC offset if it's not already set.

[ikilpatrick, 2017/02/24 17:36:57]

I might go through later and reorder everything so it roughly matches the cc
file. We are a little all over the place at the moment.

[Gleb Lanbin, 2017/02/24 18:37:00]

agree, I tried to organize things here (see "Read-only Getters" section for
example) in the past but we need all agree how we want to group methods. I like
Oracle java guideline
https://web.archive.org/web/20130627193836/http://www.oracle.com/technetwork/...
We can try to follow it here. For now I just moved this method closed to the end
before "getters" section.

+  void UpdateFragmentBfcOffset(const NGLogicalOffset& offset);
+
   NGBoxStrut CalculateMargins(const NGConstraintSpace& space,
                               const ComputedStyle& style);
 
   // Creates a new constraint space for the current child.
   NGConstraintSpace* CreateConstraintSpaceForCurrentChild();
   void FinishCurrentChildLayout(RefPtr<NGPhysicalBoxFragment>);
 
   // Layout inline children.
   void LayoutInlineChildren(NGInlineNode*);
 
@@ skipping 89 matching lines @@
   // MarginStrut for the previous child.
   NGMarginStrut curr_margin_strut_;
   NGLogicalOffset bfc_offset_;
   NGLogicalOffset curr_bfc_offset_;
   NGBoxStrut curr_child_margins_;
 };
 
 }  // namespace blink
 
 #endif  // NGBlockLayoutAlgorithm_h