Don't let rounding prematurely influence document size when printing

printing/units.cc

 // 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.
 
 #include "printing/units.h"
 
 #include "base/logging.h"
 #include "printing/print_job_constants.h"
 
 namespace printing {
 
-int ConvertUnit(int value, int old_unit, int new_unit) {
+int ConvertUnit(double value, int old_unit, int new_unit) {
   DCHECK_GT(new_unit, 0);
   DCHECK_GT(old_unit, 0);
   // With integer arithmetic, to divide a value with correct rounding, you need
   // to add half of the divisor value to the dividend value. You need to do the
   // reverse with negative number.
   if (value >= 0) {
     return ((value * new_unit) + (old_unit / 2)) / old_unit;
   } else {
     return ((value * new_unit) - (old_unit / 2)) / old_unit;
   }
@@ skipping 23 matching lines @@
 
 double ConvertPixelsToPointDouble(double pixels) {
   return ConvertUnitDouble(pixels, kPixelsPerInch, kPointsPerInch);
 }
 
 double ConvertPointsToPixelDouble(double points) {
   return ConvertUnitDouble(points, kPointsPerInch, kPixelsPerInch);
 }
 
 }  // namespace printing