Add printing.dll to the component build.

printing/printing_context_win.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_PRINTING_CONTEXT_WIN_H_
 #define PRINTING_PRINTING_CONTEXT_WIN_H_
 
 #include <ocidl.h>
 #include <commdlg.h>
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
 #include "printing/printing_context.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace printing {
 
-class PrintingContextWin : public PrintingContext {
+class PRINTING_EXPORT PrintingContextWin : public PrintingContext {
  public:
   explicit PrintingContextWin(const std::string& app_locale);
   ~PrintingContextWin();
 
   // PrintingContext implementation.
   virtual void AskUserForSettings(gfx::NativeView parent_view,
                                   int max_pages,
                                   bool has_selection,
                                   PrintSettingsCallback* callback);
   virtual Result UseDefaultSettings();
   virtual Result UpdatePrinterSettings(
       const base::DictionaryValue& job_settings,
       const PageRanges& ranges);
   virtual Result InitWithSettings(const PrintSettings& settings);
   virtual Result NewDocument(const string16& document_name);
   virtual Result NewPage();
   virtual Result PageDone();
   virtual Result DocumentDone();
   virtual void Cancel();
   virtual void ReleaseContext();
   virtual gfx::NativeDrawingContext context() const;
 
-#if defined(UNIT_TEST)
+#if defined(UNIT_TEST) || defined(PRINTING_IMPLEMENTATION)
   // Sets a fake PrintDlgEx function pointer in tests.
   void SetPrintDialog(HRESULT (__stdcall *print_dialog_func)(LPPRINTDLGEX)) {
     print_dialog_func_ = print_dialog_func;
   }
 #endif  // defined(UNIT_TEST)
 
   // Allocates the HDC for a specific DEVMODE.
   static bool AllocateContext(const std::wstring& printer_name,
                               const DEVMODE* dev_mode,
                               gfx::NativeDrawingContext* context);
@@ skipping 36 matching lines @@
   // Function pointer that defaults to PrintDlgEx. It can be changed using
   // SetPrintDialog() in tests.
   HRESULT (__stdcall *print_dialog_func_)(LPPRINTDLGEX);
 
   DISALLOW_COPY_AND_ASSIGN(PrintingContextWin);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTING_CONTEXT_WIN_H_