Add printing.dll to the component build.

printing/backend/win_helper.h

 // Copyright (c) 2010 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_BACKEND_WIN_HELPER_H_
 #define PRINTING_BACKEND_WIN_HELPER_H_
 #pragma once
 
 #include <objidl.h>
 #include <winspool.h>
 #include <prntvpt.h>
 #include <xpsprint.h>
 
 #include "base/string16.h"
+#include "printing/printing_export.h"
 
 // These are helper functions for dealing with Windows Printing.
 namespace printing {
 
 // Wrapper class to wrap the XPS APIs (PTxxx APIs). This is needed because these
 // APIs are not available by default on XP. We could delayload prntvpt.dll but
 // this would mean having to add that to every binary that links with
 // printing.lib (which is a LOT of binaries). So choosing the GetProcAddress
 // route instead).
-class XPSModule {
+class PRINTING_EXPORT XPSModule {
  public:
   // All the other methods can ONLY be called after a successful call to Init.
   // Init can be called many times and by multiple threads.
   static bool Init();
   static HRESULT OpenProvider(const string16& printer_name,
                               DWORD version,
                               HPTPROVIDER *provider);
   static HRESULT GetPrintCapabilities(HPTPROVIDER provider,
                                       IStream *print_ticket,
                                       IStream *capabilities,
@@ skipping 18 matching lines @@
                                              IStream* result_ticket,
                                              BSTR* error_message);
   static HRESULT ReleaseMemory(PVOID buffer);
   static HRESULT CloseProvider(HPTPROVIDER provider);
  private:
   XPSModule() { }
   static bool InitImpl();
 };
 
 // See comments in cc file explaining why we need this.
-class ScopedXPSInitializer {
+class PRINTING_EXPORT ScopedXPSInitializer {
  public:
   ScopedXPSInitializer();
   ~ScopedXPSInitializer();
 
   bool initialized() const { return initialized_; }
 
  private:
   bool initialized_;
 };
 
 // Wrapper class to wrap the XPS Print APIs (these are different from the PTxxx
 // which deal with the XML Print Schema). This is needed because these
 // APIs are only available on Windows 7 and higher.
-class XPSPrintModule {
+class PRINTING_EXPORT XPSPrintModule {
  public:
   // All the other methods can ONLY be called after a successful call to Init.
   // Init can be called many times and by multiple threads.
   static bool Init();
   static HRESULT StartXpsPrintJob(
       const LPCWSTR printer_name,
       const LPCWSTR job_name,
       const LPCWSTR output_file_name,
       HANDLE progress_event,
       HANDLE completion_event,
       UINT8 *printable_pages_on,
       UINT32 printable_pages_on_count,
       IXpsPrintJob **xps_print_job,
       IXpsPrintJobStream **document_stream,
       IXpsPrintJobStream **print_ticket_stream);
  private:
   XPSPrintModule() { }
   static bool InitImpl();
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_BACKEND_WIN_HELPER_H_