Add printing.dll to the component build.

printing/pdf_metafile_cairo_linux.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_CAIRO_LINUX_H_
 #define PRINTING_PDF_METAFILE_CAIRO_LINUX_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "printing/metafile.h"
 
 namespace gfx {
 class Point;
 class Rect;
 class Size;
 }
 
 typedef struct _cairo_surface cairo_surface_t;
 
 namespace printing {
 
 // This class uses Cairo graphics library to generate PDF stream and stores
 // rendering results in a string buffer.
-class PdfMetafileCairo : public Metafile {
+class PRINTING_EXPORT PdfMetafileCairo : public Metafile {
  public:
   PdfMetafileCairo();
   virtual ~PdfMetafileCairo();
 
   // Metafile methods.
   virtual bool Init();
 
   //  Calling InitFromData() sets the data for this metafile and masks data
   //  induced by previous calls to Init() or InitFromData(), even if drawing
   //  continues on the surface returned by a previous call to Init().
@@ skipping 42 matching lines @@
   // Points to the appropriate buffer depending on the way the object was
   // initialized (Init() vs InitFromData()).
   std::string* current_data_;
 
   DISALLOW_COPY_AND_ASSIGN(PdfMetafileCairo);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PDF_METAFILE_CAIRO_LINUX_H_