Include <algorithm> if you use functions from <algorithm>.

third_party/WebKit/Source/core/style/GridResolvedPosition.cpp

 // Copyright 2014 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.
 
 #include "config.h"
 #include "core/style/GridResolvedPosition.h"
 
 #include "core/layout/LayoutBox.h"
 #include "core/style/GridCoordinate.h"
+#include <algorithm>
 
 namespace blink {
 
 static const NamedGridLinesMap& gridLinesForSide(const ComputedStyle& style, GridPositionSide side)
 {
     return (side == ColumnStartSide || side == ColumnEndSide) ? style.namedGridColumnLines() : style.namedGridRowLines();
 }
 
 static inline String implicitNamedGridLineForSide(const String& lineName, GridPositionSide side)
 {
@@ skipping 275 matching lines @@
 
     if (resolvedFinalPosition < resolvedInitialPosition)
         std::swap(resolvedFinalPosition, resolvedInitialPosition);
     else if (resolvedFinalPosition == resolvedInitialPosition)
         resolvedFinalPosition = resolvedInitialPosition + 1;
 
     return GridSpan::definiteGridSpan(resolvedInitialPosition, resolvedFinalPosition);
 }
 
 } // namespace blink