Implement print preview tab controller.

chrome/test/testing_browser_process.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.
 
 // An implementation of BrowserProcess for unit tests that fails for most
 // services. By preventing creation of services, we reduce dependencies and
 // keep the profile clean. Clients of this class must handle the NULL return
 // value, however.
 
 #ifndef CHROME_TEST_TESTING_BROWSER_PROCESS_H_
@@ skipping 123 matching lines @@
   }
 
   virtual bool IsShuttingDown() {
     return false;
   }
 
   virtual printing::PrintJobManager* print_job_manager() {
     return NULL;
   }
 
+  virtual printing::PrintPreviewTabController* print_preview_tab_controller() {
+    return NULL;
+  }
+
   virtual const std::string& GetApplicationLocale() {
     return app_locale_;
   }
 
   virtual void SetApplicationLocale(const std::string& app_locale) {
     app_locale_ = app_locale;
   }
 
   virtual DownloadStatusUpdater* download_status_updater() {
     return NULL;
@@ skipping 28 matching lines @@
   scoped_ptr<Clipboard> clipboard_;
   std::string app_locale_;
 
   PrefService* pref_service_;
   scoped_ptr<GoogleURLTracker> google_url_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(TestingBrowserProcess);
 };
 
 #endif  // CHROME_TEST_TESTING_BROWSER_PROCESS_H_