[Athena] Add status icons and system time to the desktop background

athena/main/placeholder.cc

Index: athena/main/placeholder.cc
diff --git a/athena/main/placeholder.cc b/athena/main/placeholder.cc
index ba93ce87142ef6894382832d705b090c2400e060..25e03709514e59808ed1b1ab46fa42dc0db08fc2 100644
--- a/athena/main/placeholder.cc
+++ b/athena/main/placeholder.cc
@@ -6,7 +6,7 @@
 
 #include "athena/activity/public/activity_factory.h"
 #include "athena/activity/public/activity_manager.h"
-#include "athena/screen/public/screen_manager.h"
+#include "athena/system/public/system_ui.h"
 #include "grit/athena_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image_skia.h"
@@ -26,5 +26,5 @@ void CreateTestPages(content::BrowserContext* browser_context) {
 void SetupBackgroundImage() {
   const gfx::ImageSkia wallpaper = *ui::ResourceBundle::GetSharedInstance()
       .GetImageSkiaNamed(IDR_ATHENA_BACKGROUND);
-  athena::ScreenManager::Get()->SetBackgroundImage(wallpaper);
+  athena::SystemUI::Get()->SetBackgroundImage(wallpaper);
 }