Add debug to WallpaperManagerBrowserTest.DisplayChange test.

chrome/browser/chromeos/login/wallpaper_manager.h

 // Copyright (c) 2013 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_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 203 matching lines @@
   // NULL). Returns true on success.
   static bool ResizeAndSaveWallpaper(const gfx::ImageSkia& image,
                                      const base::FilePath& path,
                                      ash::WallpaperLayout layout,
                                      int preferred_width,
                                      int preferred_height,
                                      gfx::ImageSkia* output_skia);
 
   // Returns the appropriate wallpaper resolution for all root windows.
   static WallpaperResolution GetAppropriateResolution();
+  // This is a temporary variant of the previous method to investigate
+  // a problem with WallpaperManagetBrowserTest.
+  static WallpaperResolution GetAppropriateResolutionForTesting();
 
   void SetCommandLineForTesting(base::CommandLine* command_line);
 
   // Indicates imminent shutdown, allowing the WallpaperManager to remove any
   // observers it has registered.
   void Shutdown();
 
   // Adds PowerManagerClient, TimeZoneSettings and CrosSettings observers.
   void AddObservers();
 
@@ skipping 366 matching lines @@
 
   // Current decoded default image is stored in cache.
   scoped_ptr<UserImage> default_wallpaper_image_;
 
   DISALLOW_COPY_AND_ASSIGN(WallpaperManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_