[CSS Typed OM] Implement CSSUnit::to for fixed length types

third_party/WebKit/Source/core/css/CSSHelper.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef CSSHelper_h
 #define CSSHelper_h
 
 #include "platform/wtf/Forward.h"
 
 namespace blink {
 
+const double kMillimetersPerCentimeter = 10;
+const double kCentimetersPerInch = 2.54;
+const double kMillimetersPerInch = 25.4;
+const double kPointsPerInch = 72;
+const double kPicasPerInch = 6;
+
 // These conversions are defined in css-values
 const double kCssPixelsPerInch = 96;
-const double kCssPixelsPerCentimeter = kCssPixelsPerInch / 2.54;  // 2.54 cm/in
-const double kCssPixelsPerMillimeter = kCssPixelsPerCentimeter / 10;
-const double kCssPixelsPerPoint = kCssPixelsPerInch / 72;
-const double kCssPixelsPerPica = kCssPixelsPerInch / 6;
+const double kCssPixelsPerCentimeter = kCssPixelsPerInch / kCentimetersPerInch;
+const double kCssPixelsPerMillimeter =
+    kCssPixelsPerCentimeter / kMillimetersPerCentimeter;
+const double kCssPixelsPerPoint = kCssPixelsPerInch / kPointsPerInch;
+const double kCssPixelsPerPica = kCssPixelsPerInch / kPicasPerInch;
 
 }  // namespace blink
 
 #endif  // CSSHelper_h