Add feature flag for CryptAuth v2 Enrollment

The flag added here will be used to eventually enable use of the
CryptAuth v2 Enrollment protocol (https://go/cryptauth2-enrollment). The
Chrome OS migration plan from CryptAuth v1 to v2 Enrollment is outlined
in the design document https://go/cryptauthv2-enrollment-migration-cros.

Bug: 899080
Change-Id: Ie84b33acb2fbf262ad2193a438a4bb61c633c49b
Reviewed-on: https://chromium-review.googlesource.com/c/1380339
Reviewed-by: Kyle Horimoto <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Commit-Queue: Josh Nohle <[email protected]>
Cr-Commit-Position: refs/heads/master@{#617276}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index ab4fd58..90a32c3 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1908,6 +1908,9 @@
 extern const char kCrostiniUsbSupportName[];
 extern const char kCrostiniUsbSupportDescription[];
 
+extern const char kCryptAuthV2EnrollmentName[];
+extern const char kCryptAuthV2EnrollmentDescription[];
+
 extern const char kDisableExplicitDmaFencesName[];
 extern const char kDisableExplicitDmaFencesDescription[];