Save user selected wallpaper information to local state.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index a5f4ad9f652f3e114cdc235e0aa931904c9b4899..13494c22dea75052ac1ff16703cd72210e91f6d1 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1795,6 +1795,9 @@ const char kSyncSpareBootstrapToken[] = "sync.spare_bootstrap_token";
 // A pref holding the value of the policy used to disable mounting of external
 // storage for the user.
 const char kExternalStorageDisabled[] = "hardware.external_storage_disabled";
+
+// A dictionary that maps usernames to wallpaper properties.
+const char kUsersWallpaperInfo[] = "user_wallpaper_info";
 #endif
 
 // Whether there is a Flash version installed that supports clearing LSO data.