Added a test that currently is able to print to pdf.

chrome/browser/ui/webui/print_preview/print_preview_ui.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_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_UI_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
@@ skipping 138 matching lines @@
    public:
     virtual bool IsAutoCancelEnabled() = 0;
     virtual void DidGetPreviewPageCount(int page_count) = 0;
     virtual void DidRenderPreviewPage(content::WebContents* preview_dialog) = 0;
   };
 
   static void SetDelegateForTesting(TestingDelegate* delegate);
 
  private:
   friend class PrintPreviewHandlerTest;
+  friend class PrintPreviewPdfGeneratedBrowserTest;
   FRIEND_TEST_ALL_PREFIXES(PrintPreviewHandlerTest, StickyMarginsCustom);
   FRIEND_TEST_ALL_PREFIXES(PrintPreviewHandlerTest, StickyMarginsDefault);
   FRIEND_TEST_ALL_PREFIXES(PrintPreviewHandlerTest,
                            StickyMarginsCustomThenDefault);
   FRIEND_TEST_ALL_PREFIXES(PrintPreviewHandlerTest,
                            GetLastUsedMarginSettingsCustom);
   FRIEND_TEST_ALL_PREFIXES(PrintPreviewHandlerTest,
                            GetLastUsedMarginSettingsDefault);
   FRIEND_TEST_ALL_PREFIXES(PrintPreviewDialogControllerUnitTest,
                            TitleAfterReload);
+  FRIEND_TEST_ALL_PREFIXES(PrintPreviewPdfGeneratedBrowserTest,

[Lei Zhang, 2014/07/08 01:11:37]

Maybe just add a public SetSelectedFileForTesting method and use that instead of
being a friend, since that's the one thing you need to be a friend for. You
probably can also drop the friend in print_preview_handler.h.

+                           DummyTest);
 
   // Returns the Singleton instance of the PrintPreviewDataService.
   PrintPreviewDataService* print_preview_data_service();
 
   base::TimeTicks initial_preview_start_time_;
 
   // The unique ID for this class instance. Stored here to avoid calling
   // GetIDForPrintPreviewUI() everywhere.
   const int32 id_;
 
@@ skipping 13 matching lines @@
   // title.
   base::string16 initiator_title_;
 
   // Keeps track of whether OnClosePrintPreviewDialog() has been called or not.
   bool dialog_closed_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_UI_H_