If customization includes default wallpaper, download and apply it.

ash/desktop_background/desktop_background_controller.h

Index: ash/desktop_background/desktop_background_controller.h
diff --git a/ash/desktop_background/desktop_background_controller.h b/ash/desktop_background/desktop_background_controller.h
index 505f7441792b86584a009f06becf2453195119f0..5f02fcaae2b870d735833a4b82af639be2f09a4a 100644
--- a/ash/desktop_background/desktop_background_controller.h
+++ b/ash/desktop_background/desktop_background_controller.h
@@ -83,9 +83,7 @@ class ASH_EXPORT DesktopBackgroundController
     return desktop_background_mode_;
   }
 
-  void set_command_line_for_testing(base::CommandLine* command_line) {
-    command_line_for_testing_ = command_line;
-  }
+  void set_command_line_for_testing(base::CommandLine* command_line);
 
   // Add/Remove observers.
   void AddObserver(DesktopBackgroundControllerObserver* observer);
@@ -132,6 +130,11 @@ class ASH_EXPORT DesktopBackgroundController
   // Returns true if the desktop moved.
   bool MoveDesktopToUnlockedContainer();
 
+  // Use given files as default wallpaper.
+  void SetDefaultWallpaperPath(
+      const base::FilePath& customized_default_wallpaper_file_small,
+      const base::FilePath& customized_default_wallpaper_file_large);
+
   // Overrides DisplayController::Observer:
   virtual void OnDisplayConfigurationChanged() OVERRIDE;
 
@@ -142,11 +145,22 @@ class ASH_EXPORT DesktopBackgroundController
   // An operation to asynchronously loads wallpaper.
   class WallpaperLoader;
 
+  // Init "*default_*_wallpaper_file_" from given command line.
+  void SetDefaultWallpaperPathFromCommandLine(base::CommandLine* command_line);
+
   // Returns true if the specified default wallpaper is already being
   // loaded by |wallpaper_loader_| or stored in |current_wallpaper_|.
+  // (i.e. no need to reload if exactly duplicate request received)
   bool DefaultWallpaperIsAlreadyLoadingOrLoaded(
       const base::FilePath& image_file, int image_resource_id) const;
 
+  // Returns true if the specified default wallpaper file is already being
+  // loaded |wallpaper_loader_| or stored in |current_wallpaper_|.

[Mattias Nissler (ping if slow), 2014/03/24 20:38:54]

nit: ... loaded *by* |wallpaper_loader|...

[Alexander Alekseev, 2014/03/25 14:38:29]

Done.

+  // (i.e. if current wallpaper is "default" and we need to replace the default
+  // wallpaper with another file, we need to initiate SetDefaultWallpaper() )
+  bool DefaultWallpaperFileIsAlreadyLoadingOrLoaded(
+      const base::FilePath& image_file) const;
+
   // Returns true if the specified custom wallpaper is already stored
   // in |current_wallpaper_|.
   bool CustomWallpaperIsAlreadyLoaded(const gfx::ImageSkia& image) const;
@@ -190,6 +204,14 @@ class ASH_EXPORT DesktopBackgroundController
   // maximum width of all displays, and the maximum height of all displays.
   static gfx::Size GetMaxDisplaySizeInNative();
 
+  // SetDefaultWallpaper using given path and mode.
+  bool DoSetDefaultWallpaper(const base::FilePath& file_path,
+                             const bool use_large);
+
+  // Before setting first wallpaper we need to check and probably apply
+  // device customization.
+  void CheckForCustomization();
+
   // If non-NULL, used in place of the real command line.
   base::CommandLine* command_line_for_testing_;
 
@@ -222,6 +244,14 @@ class ASH_EXPORT DesktopBackgroundController
 
   int wallpaper_reload_delay_;
 
+  base::FilePath default_small_wallpaper_file_;
+  base::FilePath default_large_wallpaper_file_;
+
+  base::FilePath guest_default_small_wallpaper_file_;
+  base::FilePath guest_default_large_wallpaper_file_;
+
+  bool customization_applied_;
+
   DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundController);
 };