Add a browser test that can communicate with the layout test framework and print pdfs.

chrome/browser/ui/webui/print_preview/print_preview_handler.h

 // Copyright (c) 2012 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_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 88 matching lines @@
       print_operation) OVERRIDE;
   virtual void OnPrivetPrintingError(
       const local_discovery::PrivetLocalPrintOperation* print_operation,
         int http_code) OVERRIDE;
 #endif  // ENABLE_SERVICE_DISCOVERY
   int regenerate_preview_request_count() const {
     return regenerate_preview_request_count_;
   }
 
  private:
+  friend class PrintPreviewPdfGeneratedBrowserTest;
+  FRIEND_TEST_ALL_PREFIXES(PrintPreviewPdfGeneratedBrowserTest,
+                           MANUAL_DummyTest);
   class AccessTokenService;
 
   static bool PrivetPrintingEnabled();
 
   content::WebContents* preview_web_contents() const;
 
   // Gets the list of printers. |args| is unused.
   void HandleGetPrinters(const base::ListValue* args);
 
   // Starts getting all local privet printers. |arg| is unused.
@@ skipping 207 matching lines @@
   scoped_ptr<local_discovery::PrivetLocalPrintOperation>
       privet_local_print_operation_;
 #endif
 
   base::WeakPtrFactory<PrintPreviewHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_