Printing: Convert PrintingContext into an interface implemented by the separate

printing/printing_test.h

 // Copyright (c) 2006-2008 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 CHROME_BROWSER_PRINTING_PRINTING_TEST_H__
 #define CHROME_BROWSER_PRINTING_PRINTING_TEST_H__
 
 #include <windows.h>
 #include <winspool.h>
 
+#include <string>
+
+#include "base/basictypes.h"
+
 // Disable the whole test case when executing on a computer that has no printer
 // installed.
 // Note: Parent should be testing::Test or UITest.
 template<typename Parent>
 class PrintingTest : public Parent {
  public:
   static bool IsTestCaseDisabled() {
     return GetDefaultPrinter().empty();
   }
   static std::wstring GetDefaultPrinter() {
     wchar_t printer_name[MAX_PATH];
     DWORD size = arraysize(printer_name);
     BOOL result = ::GetDefaultPrinter(printer_name, &size);
     if (result == 0) {
       if (GetLastError() == ERROR_FILE_NOT_FOUND) {
         printf("There is no printer installed, printing can't be tested!\n");
         return std::wstring();
       }
       printf("INTERNAL PRINTER ERROR!\n");
       return std::wstring();
     }
     return printer_name;
   }
 };
 
 #endif  // CHROME_BROWSER_PRINTING_PRINTING_TEST_H__