Set wallpaper from right click menu in Files app.

chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc

Index: chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc
diff --git a/chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc b/chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc
index 5f78e2cfb142d9af8ac0391336ac325214d7ecdf..0dbfa19d2ae817b045725da45c1198b8b6f74886 100644
--- a/chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc
+++ b/chrome/browser/chromeos/extensions/file_manager/private_api_strings.cc
@@ -426,6 +426,8 @@ bool FileManagerPrivateGetStringsFunction::RunSync() {
   SET_STRING("ERROR_HIDDEN_NAME", IDS_FILE_BROWSER_ERROR_HIDDEN_NAME);
   SET_STRING("ERROR_INVALID_CHARACTER",
              IDS_FILE_BROWSER_ERROR_INVALID_CHARACTER);
+  SET_STRING("ERROR_INVALID_WALLPAPER",
+             IDS_WALLPAPER_MANAGER_INVALID_WALLPAPER);
   SET_STRING("ERROR_LONG_NAME", IDS_FILE_BROWSER_ERROR_LONG_NAME);
   SET_STRING("ERROR_PROGRESS_SUMMARY", IDS_FILE_BROWSER_ERROR_PROGRESS_SUMMARY);
   SET_STRING("ERROR_PROGRESS_SUMMARY_PLURAL",
@@ -541,6 +543,7 @@ bool FileManagerPrivateGetStringsFunction::RunSync() {
              IDS_FILE_BROWSER_CHANGE_TO_THUMBNAILVIEW_BUTTON_LABEL);
   SET_STRING("CANCEL_SELECTION_BUTTON_LABEL",
              IDS_FILE_BROWSER_CANCEL_SELECTION_BUTTON_LABEL);
+  SET_STRING("SET_WALLPAPER_BUTTON_LABEL", IDS_SET_WALLPAPER_BUTTON);
   SET_STRING("SHARE_ERROR", IDS_FILE_BROWSER_SHARE_ERROR);
 
   SET_STRING("SIZE_BYTES", IDS_FILE_BROWSER_SIZE_BYTES);