Implement Federated PSL Matches in Native Backends

components/password_manager/core/browser/psl_matching_helper.h

Index: components/password_manager/core/browser/psl_matching_helper.h
diff --git a/components/password_manager/core/browser/psl_matching_helper.h b/components/password_manager/core/browser/psl_matching_helper.h
index 56b2ac408ea15b01946a2d49fa355b0fb5dbf19f..d5839c54205fc08946a9a4eb9594327b3ce0cbea 100644
--- a/components/password_manager/core/browser/psl_matching_helper.h
+++ b/components/password_manager/core/browser/psl_matching_helper.h
@@ -5,8 +5,10 @@
 #ifndef COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PSL_MATCHING_HELPER_H_
 #define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PSL_MATCHING_HELPER_H_
 
+#include <iosfwd>
 #include <string>
 
+#include "components/password_manager/core/browser/password_store.h"
 
 class GURL;
 
@@ -23,6 +25,21 @@ enum PSLDomainMatchMetric {
   PSL_DOMAIN_MATCH_COUNT
 };
 
+enum class MatchResult {
+  NO_MATCH,
+  EXACT_MATCH,
+  PSL_MATCH,
+  FEDERATED_MATCH,
+  FEDERATED_PSL_MATCH,
+};
+
+// For testing.
+std::ostream& operator<<(std::ostream& out, MatchResult result);
+
+// Returns what type of match applies to |form| and |form_digest|.
+MatchResult GetMatchResult(const autofill::PasswordForm& form,
+                           const PasswordStore::FormDigest& form_digest);
+
 // Using the public suffix list for matching the origin is only needed for
 // websites that do not have a single hostname for entering credentials. It
 // would be better for their users if they did, but until then we help them find