Add printing.dll to the component build.

printing/pdf_metafile_skia.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_PDF_METAFILE_SKIA_H_
 #define PRINTING_PDF_METAFILE_SKIA_H_
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
 #include "printing/metafile.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 namespace printing {
 
 struct PdfMetafileSkiaData;
 
 // This class uses Skia graphics library to generate a PDF document.
-class PdfMetafileSkia : public Metafile {
+class PRINTING_EXPORT PdfMetafileSkia : public Metafile {
  public:
   PdfMetafileSkia();
   virtual ~PdfMetafileSkia();
 
   // Metafile methods.
   virtual bool Init();
   virtual bool InitFromData(const void* src_buffer, uint32 src_buffer_size);
 
   virtual SkDevice* StartPageForVectorCanvas(
       const gfx::Size& page_size,
@@ skipping 42 matching lines @@
 
   // True when finish page is outstanding for current page.
   bool page_outstanding_;
 
   DISALLOW_COPY_AND_ASSIGN(PdfMetafileSkia);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PDF_METAFILE_SKIA_H_