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

athena/screen/public/screen_manager.h

Index: athena/screen/public/screen_manager.h
diff --git a/athena/screen/public/screen_manager.h b/athena/screen/public/screen_manager.h
index 52dd805646aed026be2ce542c7acd43657d505f5..df1dfe3a6629bbf6a7fc16dc4da2abe38204958d 100644
--- a/athena/screen/public/screen_manager.h
+++ b/athena/screen/public/screen_manager.h
@@ -14,11 +14,6 @@ namespace aura {
 class Window;
 }
 
-namespace gfx {
-class ImageSkia;
-class Insets;
-}
-
 namespace ui {
 class LayerAnimator;
 }
@@ -68,9 +63,6 @@ class ATHENA_EXPORT ScreenManager {
   // Return the context object to be used for widget creation.
   virtual aura::Window* GetContext() = 0;
 
-  // Sets the background image.
-  virtual void SetBackgroundImage(const gfx::ImageSkia& image) = 0;
-
   // Set screen rotation.
   // TODO(flackr): Extract and use ash DisplayManager to set rotation
   // instead: http://crbug.com/401044.