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

third_party/WebKit/Source/core/layout/ng/geometry/ng_box_strut.h

Index: third_party/WebKit/Source/core/layout/ng/geometry/ng_box_strut.h
diff --git a/third_party/WebKit/Source/core/layout/ng/geometry/ng_box_strut.h b/third_party/WebKit/Source/core/layout/ng/geometry/ng_box_strut.h
index 2e14309b431cedbb9662bba3d15ca1ee25420f5b..fe6bf1f845f8fe34102e13d36a4196f43f52df3f 100644
--- a/third_party/WebKit/Source/core/layout/ng/geometry/ng_box_strut.h
+++ b/third_party/WebKit/Source/core/layout/ng/geometry/ng_box_strut.h
@@ -6,6 +6,7 @@
 #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"
@@ -28,6 +29,10 @@ struct CORE_EXPORT NGBoxStrut {
   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