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

athena/screen/public/screen_manager.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ATHENA_SCREEN_PUBLIC_SCREEN_MANAGER_H_
 #define ATHENA_SCREEN_PUBLIC_SCREEN_MANAGER_H_
 
 #include <string>
 
 #include "athena/athena_export.h"
 #include "ui/gfx/display.h"
 
 namespace aura {
 class Window;
 }
 
-namespace gfx {
-class ImageSkia;
-class Insets;
-}
-
 namespace ui {
 class LayerAnimator;
 }
 
 namespace wm {
 class FocusRules;
 }
 
 namespace athena {
 class ScreenManagerDelegate;
@@ skipping 29 matching lines @@
   // widget without specific parent.
   virtual aura::Window* CreateDefaultContainer(
       const ContainerParams& params) = 0;
 
   // Creates the container window on the screen.
   virtual aura::Window* CreateContainer(const ContainerParams& params) = 0;
 
   // 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.
   virtual void SetRotation(gfx::Display::Rotation rotation) = 0;
 
   // Returns the LayerAnimator to use to animate the entire screen (e.g. fade
   // screen to white).
   virtual ui::LayerAnimator* GetScreenAnimator() = 0;
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_SCREEN_PUBLIC_SCREEN_MANAGER_H_