[LayoutNG] Use NGLogicalSize in NGBlockLayoutAlgorithm

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

Index: third_party/WebKit/Source/core/layout/ng/geometry/ng_logical_size.h
diff --git a/third_party/WebKit/Source/core/layout/ng/geometry/ng_logical_size.h b/third_party/WebKit/Source/core/layout/ng/geometry/ng_logical_size.h
index 448cd9d0bd9c0eef3ef6b236fcd4f549882fd807..af0e5e987a8a685d462a02ea32f398548ed99da3 100644
--- a/third_party/WebKit/Source/core/layout/ng/geometry/ng_logical_size.h
+++ b/third_party/WebKit/Source/core/layout/ng/geometry/ng_logical_size.h
@@ -6,6 +6,7 @@
 #define NGLogicalSize_h
 
 #include "core/CoreExport.h"
+#include "core/layout/ng/geometry/ng_box_strut.h"
 #include "core/layout/ng/ng_writing_mode.h"
 #include "platform/LayoutUnit.h"
 
@@ -32,6 +33,12 @@ struct CORE_EXPORT NGLogicalSize {
   }
 };
 
+inline NGLogicalSize& operator-=(NGLogicalSize& a, const NGBoxStrut& b) {
+  a.inline_size -= b.InlineSum();
+  a.block_size -= b.BlockSum();
+  return a;
+}
+
 CORE_EXPORT std::ostream& operator<<(std::ostream&, const NGLogicalSize&);
 
 }  // namespace blink