Add fade to white animation when power button is pressed on Athena

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 "base/memory/scoped_ptr.h"
 
 namespace aura {
 class Window;
 }
 
 namespace gfx {
 class ImageSkia;
 }
 
 namespace wm {
 class FocusRules;
 }
 
 namespace athena {
+class ScreenAnimator;
 
 // Mananges basic UI components on the screen such as background, and provide
 // API for other UI components, such as window manager, home card, to
 // create and manage their windows on the screen.
 class ATHENA_EXPORT ScreenManager {
  public:
   struct ContainerParams {
     ContainerParams(const std::string& name, int z_order_priority);
     std::string name;
 
@@ skipping 22 matching lines @@
 
   // 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;
 
+  // Creates a ScreenAnimator.
+  virtual scoped_ptr<ScreenAnimator> CreateScreenAnimator() = 0;

[oshima, 2014/08/08 14:56:59]

Sorry if I wasn't clear. I meant

ui::LayerAnimator ScreenManager::GetScreenAnimator();

Animation itself should be in other place (system is fine fornow)

I probably will rework a bit on this API (thinking of an animation object you
can apply), but the above API is good for now.

+
   // Create a focus rules.
   // TODO(oshima): Make this virtual function.
   static wm::FocusRules* CreateFocusRules();
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_SCREEN_PUBLIC_SCREEN_MANAGER_H_