Update app.mojom

Add AppDataRequestState.NOT_SIGNED_IN to support ag/5485166

Bug: b:118888407
Test: compile
Change-Id: If708bbad7a400edacd8c0b144ba1903c448d9286
Reviewed-on: https://chromium-review.googlesource.com/c/1331952Reviewed-by: Yury Khmel <khmel@chromium.org>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Commit-Queue: Vladislav Kaznacheev <kaznacheev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607993}

components/arc/common/app.mojom

@@ -156,6 +156,8 @@ enum AppDataRequestState {
   APP_DATA_SEARCH_PROXY_NOT_AVAILABLE = 7,
   // Failed to call globalQuery to GmsCore.
   FAILED_TO_CALL_GLOBALQUERY = 8,
+  // Failed to sign into GmsCore.
+  NOT_SIGNED_IN = 9,
 };
 
 // Describes the category type of app shortcut item.