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diff --git a/chromium/ash/desktop_background/user_wallpaper_delegate.h b/chromium/ash/desktop_background/user_wallpaper_delegate.h
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+++ b/chromium/ash/desktop_background/user_wallpaper_delegate.h
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+// Copyright 2012 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 ASH_DESKTOP_BACKGROUND_USER_WALLPAPER_DELEGATE_H_
+#define ASH_DESKTOP_BACKGROUND_USER_WALLPAPER_DELEGATE_H_
+
+#include "ash/ash_export.h"
+#include "ui/views/corewm/window_animations.h"
+
+namespace ash {
+
+class ASH_EXPORT UserWallpaperDelegate {
+ public:
+  virtual ~UserWallpaperDelegate() {}
+
+  // Returns the type of window animation that should be used when showing the
+  // wallpaper.
+  virtual int GetAnimationType() = 0;
+
+  // Should the slower initial animation be shown (as opposed to the faster
+  // animation that's used e.g. when switching from one user's wallpaper to
+  // another's on the login screen)?
+  virtual bool ShouldShowInitialAnimation() = 0;
+
+  // Updates current wallpaper. It may switch the size of wallpaper based on the
+  // current display's resolution.
+  virtual void UpdateWallpaper() = 0;
+
+  // Initialize wallpaper.
+  virtual void InitializeWallpaper() = 0;
+
+  // Opens the set wallpaper page in the browser.
+  virtual void OpenSetWallpaperPage() = 0;
+
+  // Returns true if user can open set wallpaper page. Only guest user returns
+  // false currently.
+  virtual bool CanOpenSetWallpaperPage() = 0;
+
+  // Notifies delegate that wallpaper animation has finished.
+  virtual void OnWallpaperAnimationFinished() = 0;
+
+  // Notifies delegate that wallpaper boot animation has finished.
+  virtual void OnWallpaperBootAnimationFinished() = 0;
+};
+
+}  // namespace ash
+
+#endif  // ASH_DESKTOP_BACKGROUND_USER_WALLPAPER_DELEGATE_H_