Reset constraint space's BFC offset if block creates a new FC

third_party/WebKit/Source/core/layout/ng/geometry/ng_box_strut.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 NGBoxStrut_h
 #define NGBoxStrut_h
 
 #include "core/CoreExport.h"
+#include "core/layout/ng/geometry/ng_logical_offset.h"
 #include "core/layout/ng/ng_writing_mode.h"
 #include "platform/LayoutUnit.h"
 #include "platform/text/TextDirection.h"
 
 namespace blink {
 
 // This struct is used for storing margins, borders or padding of a box on all
 // four edges.
 struct CORE_EXPORT NGBoxStrut {
   NGBoxStrut() {}
   NGBoxStrut(LayoutUnit inline_start,
              LayoutUnit inline_end,
              LayoutUnit block_start,
              LayoutUnit block_end)
       : inline_start(inline_start),
         inline_end(inline_end),
         block_start(block_start),
         block_end(block_end) {}
 
   LayoutUnit InlineSum() const { return inline_start + inline_end; }
   LayoutUnit BlockSum() const { return block_start + block_end; }
 
+  NGLogicalOffset InlineBlockStartOffset() {
+    return {inline_start, block_start};
+  }
+
   bool IsEmpty() const;
 
   // The following two operators exist primarily to have an easy way to access
   // the sum of border and padding.
   NGBoxStrut& operator+=(const NGBoxStrut& other) {
     inline_start += other.inline_start;
     inline_end += other.inline_end;
     block_start += other.block_start;
     block_end += other.block_end;
     return *this;
@@ skipping 24 matching lines @@
   LayoutUnit left;
   LayoutUnit right;
   LayoutUnit top;
   LayoutUnit bottom;
   NGBoxStrut ConvertToLogical(NGWritingMode, TextDirection) const;
 };
 
 }  // namespace blink
 
 #endif  // NGBoxStrut_h