[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 f14cb6219d8d33d4153771a3ae6e2b5d94ada345..7bdc086568544f581824d40feb928ea068255e57 100644
--- a/athena/main/placeholder.cc
+++ b/athena/main/placeholder.cc
@@ -7,7 +7,7 @@
 #include "athena/activity/public/activity_factory.h"
 #include "athena/activity/public/activity_manager.h"
 #include "athena/resources/grit/athena_resources.h"
-#include "athena/screen/public/screen_manager.h"
+#include "athena/system/public/system_ui.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);
 }