Add printing.dll to the component build.

printing/emf_win.h

Index: printing/emf_win.h
===================================================================
--- printing/emf_win.h	(revision 99019)
+++ printing/emf_win.h	(working copy)
@@ -23,7 +23,7 @@
 namespace printing {
 
 // Simple wrapper class that manage an EMF data stream and its virtual HDC.
-class Emf : public Metafile {
+class PRINTING_EXPORT Emf : public Metafile {
  public:
   class Record;
   class Enumerator;
@@ -118,7 +118,7 @@
 
 // One EMF record. It keeps pointers to the EMF buffer held by Emf::emf_.
 // The entries become invalid once Emf::CloseEmf() is called.
-class Emf::Record {
+class PRINTING_EXPORT Emf::Record {
  public:
   // Plays the record.
   bool Play() const;
@@ -144,7 +144,7 @@
 // Retrieves individual records out of a Emf buffer. The main use is to skip
 // over records that are unsupported on a specific printer or to play back
 // only a part of an EMF buffer.
-class Emf::Enumerator {
+class PRINTING_EXPORT Emf::Enumerator {
  public:
   // Iterator type used for iterating the records.
   typedef std::vector<Record>::const_iterator const_iterator;