[Nickname Management] Add experiment flag

Bug: 1082013
Change-Id: I25d1c4588254c39b996ce9812e829123219e3764
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2197513
Commit-Queue: Siyu An <[email protected]>
Reviewed-by: Jared Saul <[email protected]>
Cr-Commit-Position: refs/heads/master@{#768433}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 6286c10..c54865f2 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -115,6 +115,9 @@
 extern const char kAutofillCacheQueryResponsesName[];
 extern const char kAutofillCacheQueryResponsesDescription[];
 
+extern const char kAutofillEnableCardNicknameManagementName[];
+extern const char kAutofillEnableCardNicknameManagementDescription[];
+
 extern const char kAutofillEnableCompanyNameName[];
 extern const char kAutofillEnableCompanyNameDescription[];