Wallpaper manager backend APIs

ash/desktop_background/desktop_background_resources.h

Index: ash/desktop_background/desktop_background_resources.h
diff --git a/ash/desktop_background/desktop_background_resources.h b/ash/desktop_background/desktop_background_resources.h
index 7c14ce6f94a8317ead5e62ed9a5148c4766b82c0..24d1fc509f218d7ab541fdc70bb77eead7f1840d 100644
--- a/ash/desktop_background/desktop_background_resources.h
+++ b/ash/desktop_background/desktop_background_resources.h
@@ -5,6 +5,8 @@
 #ifndef ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_RESOURCES_H_
 #define ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_RESOURCES_H_
 
+#include <string>
+
 #include "ash/ash_export.h"
 #include "third_party/skia/include/core/SkColor.h"
 
@@ -29,6 +31,7 @@ struct ASH_EXPORT WallpaperInfo {
 
 const SkColor kLoginWallpaperColor = 0xFEFEFE;
 
+ASH_EXPORT WallpaperLayout GetLayoutFromString(std::string layout);
 ASH_EXPORT int GetDefaultWallpaperIndex();
 ASH_EXPORT int GetGuestWallpaperIndex();
 ASH_EXPORT int GetInvalidWallpaperIndex();