[AF][Upstream Feedback] Add a separate experiment flag for Upstream feedback

Flag usage will be added in follow-up CL crrev.com/c/1616163

Bug: 964127
Change-Id: If68f27a302f78c3659b5bca31d042cf8a2062589
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1648600
Commit-Queue: Siyu An <[email protected]>
Reviewed-by: Jared Saul <[email protected]>
Cr-Commit-Position: refs/heads/master@{#667287}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index b26830e5..05445679 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -282,6 +282,9 @@
 extern const char
     kEnableAutofillCreditCardUploadEditableExpirationDateDescription[];
 
+extern const char kEnableAutofillCreditCardUploadFeedbackName[];
+extern const char kEnableAutofillCreditCardUploadFeedbackDescription[];
+
 extern const char kEnableAutofillDoNotMigrateUnsupportedLocalCardsName[];
 extern const char kEnableAutofillDoNotMigrateUnsupportedLocalCardsDescription[];