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..7111268b407a406b0fd06901d213960e54c8c954 100644
--- a/ash/desktop_background/desktop_background_controller.h
+++ b/ash/desktop_background/desktop_background_controller.h
@@ -135,6 +135,11 @@ class ASH_EXPORT DesktopBackgroundController
   // Overrides DisplayController::Observer:
   virtual void OnDisplayConfigurationChanged() OVERRIDE;
 
+  // Use given files as default wallpaper.
+  void SetDefaultWallpaperPath(

[Daniel Erat, 2014/03/24 16:25:48]

nit: move this above the overridden method (also in .cc file)

[Alexander Alekseev, 2014/03/24 17:33:43]

Done.

+      const base::FilePath& customized_default_wallpaper_file_small,

[Daniel Erat, 2014/03/24 16:25:48]

nit: mind removing the word "customized" from these argument names? i'm worried
it might make it easy to confuse this with SetCustomWallpaper().

[Alexander Alekseev, 2014/03/24 17:33:43]

Done.

+      const base::FilePath& customized_default_wallpaper_file_large);
+
  private:
   friend class DesktopBackgroundControllerTest;
   FRIEND_TEST_ALL_PREFIXES(DesktopBackgroundControllerTest, GetMaxDisplaySize);
@@ -144,9 +149,17 @@ class ASH_EXPORT DesktopBackgroundController
 
   // 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 exacltly duplicate request received)

[Daniel Erat, 2014/03/24 16:25:48]

nit: s/exacltly/exactly/

[Alexander Alekseev, 2014/03/24 17:33:43]

Done.

   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_|.
+  // (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 +203,14 @@ 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 +243,11 @@ class ASH_EXPORT DesktopBackgroundController
 
   int wallpaper_reload_delay_;
 
+  base::FilePath customized_default_wallpaper_file_small_;
+  base::FilePath customized_default_wallpaper_file_large_;
+
+  bool customization_applied_;
+
   DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundController);
 };