Add printing.dll to the component build.

printing/units.h

Index: printing/units.h
===================================================================
--- printing/units.h	(revision 98598)
+++ printing/units.h	(working copy)
@@ -5,6 +5,8 @@
 #ifndef PRINTING_UNITS_H_
 #define PRINTING_UNITS_H_
 
+#include "printing/printing_export.h"
+
 namespace printing {
 
 // Length of a thousanth of inches in 0.01mm unit.
@@ -19,29 +21,30 @@
 const int kPixelsPerInch = 96;
 
 // Converts from one unit system to another using integer arithmetics.
-int ConvertUnit(int value, int old_unit, int new_unit);
+PRINTING_EXPORT int ConvertUnit(int value, int old_unit, int new_unit);
 
 // Converts from one unit system to another using doubles.
-double ConvertUnitDouble(double value, double old_unit, double new_unit);
+PRINTING_EXPORT double ConvertUnitDouble(double value, double old_unit,
+                                         double new_unit);
 
 // Converts from 0.001 inch unit to 0.00001 meter.
-int ConvertMilliInchToHundredThousanthMeter(int milli_inch);
+PRINTING_EXPORT int ConvertMilliInchToHundredThousanthMeter(int milli_inch);
 
 // Converts from 0.00001 meter unit to 0.001 inch.
-int ConvertHundredThousanthMeterToMilliInch(int cmm);
+PRINTING_EXPORT int ConvertHundredThousanthMeterToMilliInch(int cmm);
 
 // Converts from 1 pixel to 1 point using integers.
-int ConvertPixelsToPoint(int pixels);
+PRINTING_EXPORT int ConvertPixelsToPoint(int pixels);
 
 // Converts from 1 pixel to 1 point using doubles.
-double ConvertPixelsToPointDouble(double pixels);
+PRINTING_EXPORT double ConvertPixelsToPointDouble(double pixels);
 
 // Converts from 1 point to 1 pixel using doubles.
 double ConvertPointsToPixelDouble(double points);
 
 // Splits the horizontal width equally into segments with an interstice
 // between each segment. Returns the width of a segment.
-double GetHeaderFooterSegmentWidth(double page_width);
+PRINTING_EXPORT double GetHeaderFooterSegmentWidth(double page_width);
 
 }  // namespace printing