[layoutng] Add a function to compute the min- and max-content contribution

third_party/WebKit/Source/core/layout/ng/ng_units.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 NGUnits_h
 #define NGUnits_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_writing_mode.h"
 #include "platform/LayoutUnit.h"
 #include "platform/text/TextDirection.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class LayoutUnit;
 struct NGPhysicalOffset;
 struct NGPhysicalSize;
 struct NGBoxStrut;
 
 struct CORE_EXPORT MinAndMaxContentSizes {
   LayoutUnit min_content;
   LayoutUnit max_content;
   LayoutUnit ShrinkToFit(LayoutUnit available_size) const;
+  bool operator==(const MinAndMaxContentSizes& other) const;
 };
 
+inline std::ostream& operator<<(std::ostream& stream,
+                                const MinAndMaxContentSizes& value) {
+  return stream << "(" << value.min_content << ", " << value.max_content << ")";
+}
+
 struct NGLogicalSize {
   NGLogicalSize() {}
   NGLogicalSize(LayoutUnit inline_size, LayoutUnit block_size)
       : inline_size(inline_size), block_size(block_size) {}
 
   LayoutUnit inline_size;
   LayoutUnit block_size;
 
   NGPhysicalSize ConvertToPhysical(NGWritingMode mode) const;
   bool operator==(const NGLogicalSize& other) const;
@@ skipping 310 matching lines @@
     if (position_matches)
       return position;
     else
       return container_size - position - length - margin_start - margin_end;
   }
 };
 
 }  // namespace blink
 
 #endif  // NGUnits_h