[Passwords] Create UI Flag for HTTP FOAS

This change creates a UI flag for the HTTP Fill On Account Select
Experiment.

Bug: 914765
Change-Id: Ia81c9a9db3604859d6d5be33fa1412d37887ca3b
Reviewed-on: https://chromium-review.googlesource.com/c/1451940
Commit-Queue: Jan Wilken Dörrie <[email protected]>
Reviewed-by: Elly Fong-Jones <[email protected]>
Cr-Commit-Position: refs/heads/master@{#628793}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 5302c37..4ce2533 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -640,6 +640,9 @@
 extern const char kFillOnAccountSelectName[];
 extern const char kFillOnAccountSelectDescription[];
 
+extern const char kFillOnAccountSelectHttpName[];
+extern const char kFillOnAccountSelectHttpDescription[];
+
 extern const char kForceTextDirectionName[];
 extern const char kForceTextDirectionDescription[];
 extern const char kForceDirectionLtr[];