Merge 159822 - ash: Display system background while loading wallpaper.

ash/desktop_background/desktop_background_controller.cc

Index: ash/desktop_background/desktop_background_controller.cc
===================================================================
--- ash/desktop_background/desktop_background_controller.cc	(revision 160653)
+++ ash/desktop_background/desktop_background_controller.cc	(working copy)
@@ -6,6 +6,7 @@
 
 #include "ash/desktop_background/desktop_background_view.h"
 #include "ash/desktop_background/desktop_background_widget_controller.h"
+#include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_factory.h"
 #include "ash/shell_window_ids.h"
@@ -281,6 +282,7 @@
 
 void DesktopBackgroundController::NotifyAnimationFinished() {
   Shell* shell = Shell::GetInstance();
+  shell->GetPrimaryRootWindowController()->HandleDesktopBackgroundVisible();
   shell->user_wallpaper_delegate()->OnWallpaperAnimationFinished();
 }