Reload wallpaper when display configuration changes.

ash/default_user_wallpaper_delegate.h

Index: ash/default_user_wallpaper_delegate.h
diff --git a/ash/default_user_wallpaper_delegate.h b/ash/default_user_wallpaper_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..2e22e3054751db2b6f5190d69b4cf1211072ecde
--- /dev/null
+++ b/ash/default_user_wallpaper_delegate.h
@@ -0,0 +1,36 @@
+// Copyright 2013 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_DEFAULT_USER_WALLPAPER_DELEGATE_H_
+#define ASH_DEFAULT_USER_WALLPAPER_DELEGATE_H_
+
+#include "ash/ash_export.h"
+#include "ash/desktop_background/user_wallpaper_delegate.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+
+namespace ash {
+
+class ASH_EXPORT DefaultUserWallpaperDelegate : public UserWallpaperDelegate {
+ public:
+  DefaultUserWallpaperDelegate() {}
+  virtual ~DefaultUserWallpaperDelegate() {}
+
+  // UserWallpaperDelegate overrides:
+  virtual int GetAnimationType() OVERRIDE;
+  virtual bool ShouldShowInitialAnimation() OVERRIDE;
+  virtual void UpdateWallpaper() OVERRIDE;
+  virtual void InitializeWallpaper() OVERRIDE;
+  virtual void OpenSetWallpaperPage() OVERRIDE;
+  virtual bool CanOpenSetWallpaperPage() OVERRIDE;
+  virtual void OnWallpaperAnimationFinished() OVERRIDE;
+  virtual void OnWallpaperBootAnimationFinished() OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DefaultUserWallpaperDelegate);
+};
+
+}  // namespace ash
+
+#endif  // ASH_DEFAULT_USER_WALLPAPER_DELEGATE_H_