Enable user change background image in settings page in Aura build.

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index 4d70bbd0a61c944b9a61e1b7e2c360dc8322c4fb..9468587b9b9da7ca1aba5a3b1c9c07b16b241e60 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -49,6 +49,7 @@ class SystemTrayDelegate;
 class SystemTray;
 class VideoDetector;
 class WindowCycleController;
+class DesktopBackgroundController;

[flackr, 2012/03/05 16:16:03]

nit: Sort.

[bshe, 2012/03/06 01:33:27]

Done.

 
 namespace internal {
 class ActivationController;
@@ -184,6 +185,9 @@ class ASH_EXPORT Shell {
   internal::PartialScreenshotEventFilter* partial_screenshot_filter() {
     return partial_screenshot_filter_.get();
   }
+  DesktopBackgroundController* desktop_background_controller() {
+    return desktop_background_controller_.get();
+  }
   PowerButtonController* power_button_controller() {
     return power_button_controller_.get();
   }
@@ -289,6 +293,7 @@ class ASH_EXPORT Shell {
   scoped_ptr<internal::ShadowController> shadow_controller_;
   scoped_ptr<internal::TooltipController> tooltip_controller_;
   scoped_ptr<internal::VisibilityController> visibility_controller_;
+  scoped_ptr<DesktopBackgroundController> desktop_background_controller_;
   scoped_ptr<PowerButtonController> power_button_controller_;
   scoped_ptr<VideoDetector> video_detector_;
   scoped_ptr<WindowCycleController> window_cycle_controller_;