[Passwords] Add UseOfHashAffiliationFetcher feature flag

This change adds a new feature kUseOfHashAffiliationFetcher. This
feature will allow using Affiliation service for all users.

Bug: 1108279
Change-Id: Id8331eaa2d4d5128d2ef270a8a07802653e60149
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527140Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Viktor Semeniuk <vsemeniuk@google.com>
Cr-Commit-Position: refs/heads/master@{#826734}

components/password_manager/core/common/password_manager_features.cc

@@ -93,6 +93,10 @@ const base::Feature kSecondaryServerFieldPredictions = {
 const base::Feature kTreatNewPasswordHeuristicsAsReliable = {
     "TreatNewPasswordHeuristicsAsReliable", base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Enables use of Hash Affiliation fetcher for all requests.
+const base::Feature kUseOfHashAffiliationFetcher = {
+    "UseOfHashAffiliationFetcher", base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Enables support of filling and saving on username first flow.
 const base::Feature kUsernameFirstFlow = {"UsernameFirstFlow",
                                           base::FEATURE_DISABLED_BY_DEFAULT};

components/password_manager/core/common/password_manager_features.h

@@ -35,6 +35,7 @@ extern const base::Feature kPasswordsWeaknessCheck;
 extern const base::Feature kRecoverFromNeverSaveAndroid;
 extern const base::Feature kSecondaryServerFieldPredictions;
 extern const base::Feature kTreatNewPasswordHeuristicsAsReliable;
+extern const base::Feature kUseOfHashAffiliationFetcher;
 extern const base::Feature kUsernameFirstFlow;
 extern const base::Feature kWellKnownChangePassword;