Add end to end test for Media galleries scan API.

chrome/browser/ui/cocoa/extensions/media_galleries_scan_result_dialog_cocoa.h

 // Copyright 2014 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_COCOA_EXTENSIONS_MEDIA_GALLERIES_SCAN_RESULT_DIALOG_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_EXTENSIONS_MEDIA_GALLERIES_SCAN_RESULT_DIALOG_COCOA_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "chrome/browser/media_galleries/media_galleries_scan_result_dialog_controller.h"
@@ skipping 42 matching lines @@
   void UpdateScanResultCheckbox(const MediaGalleryPrefInfo& scan_result,
                                 bool checked,
                                 CGFloat y_pos);
 
   void InitDialogControls();
   CGFloat CreateCheckboxes(
       CGFloat y_pos,
       const MediaGalleriesScanResultDialogController::OrderedScanResults&
           scan_results);
 
+  // MediaGalleriesScanResultDialog implementation:
+  virtual void AcceptDialogForTesting() OVERRIDE;
+
   MediaGalleriesScanResultDialogController* controller_;  // weak
   scoped_ptr<ConstrainedWindowMac> window_;
 
   // The alert that the dialog is being displayed as.
   base::scoped_nsobject<ConstrainedWindowAlert> alert_;
 
   // True if the user has pressed accept.
   bool accepted_;
 
   // List of checkboxes ordered from bottom to top.
   base::scoped_nsobject<NSMutableArray> checkboxes_;
 
   // Container view for checkboxes.
   base::scoped_nsobject<NSView> checkbox_container_;
 
   // Container view for the main dialog contents.
   base::scoped_nsobject<NSBox> main_container_;
 
   // An Objective-C class to route callbacks from Cocoa code.
   base::scoped_nsobject<MediaGalleriesScanResultCocoaController>
       cocoa_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaGalleriesScanResultDialogCocoa);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_EXTENSIONS_MEDIA_GALLERIES_SCAN_RESULT_DIALOG_COCOA_H_