Don't let rounding prematurely influence document size when printing

printing/units.h

 // Copyright (c) 2011 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 PRINTING_UNITS_H_
 #define PRINTING_UNITS_H_
 
 #include "printing/printing_export.h"
 
 namespace printing {
@@ skipping 22 matching lines @@
 
 // A4: 8.27 x 11.69 inches
 const float kA4WidthInch = 8.27f;
 const float kA4HeightInch = 11.69f;
 
 // A3: 11.69 x 16.54 inches
 const float kA3WidthInch = 11.69f;
 const float kA3HeightInch = 16.54f;
 
 // Converts from one unit system to another using integer arithmetics.
-PRINTING_EXPORT int ConvertUnit(int value, int old_unit, int new_unit);
+PRINTING_EXPORT int ConvertUnit(double value, int old_unit, int new_unit);
 
 // Converts from one unit system to another using doubles.
 PRINTING_EXPORT double ConvertUnitDouble(double value, double old_unit,
                                          double new_unit);
 
 // Converts from 0.001 inch unit to 0.00001 meter.
 PRINTING_EXPORT int ConvertMilliInchToHundredThousanthMeter(int milli_inch);
 
 // Converts from 0.00001 meter unit to 0.001 inch.
 PRINTING_EXPORT int ConvertHundredThousanthMeterToMilliInch(int cmm);
 
 // Converts from 1 pixel to 1 point using integers.
 PRINTING_EXPORT int ConvertPixelsToPoint(int pixels);
 
 // Converts from 1 pixel to 1 point using doubles.
 PRINTING_EXPORT double ConvertPixelsToPointDouble(double pixels);
 
 // Converts from 1 point to 1 pixel using doubles.
 PRINTING_EXPORT double ConvertPointsToPixelDouble(double points);
 
 }  // namespace printing
 
 #endif  // PRINTING_UNITS_H_