Add flag to enable/disable affiliaton based matching.

components/password_manager/core/browser/affiliation_utils.h

Index: components/password_manager/core/browser/affiliation_utils.h
diff --git a/components/password_manager/core/browser/affiliation_utils.h b/components/password_manager/core/browser/affiliation_utils.h
index ad5af3763af9c9eb9312841b6401537967297936..ad39eb7ef7574aba0b26ea7eacb877f38f82a4dd 100644
--- a/components/password_manager/core/browser/affiliation_utils.h
+++ b/components/password_manager/core/browser/affiliation_utils.h
@@ -51,6 +51,10 @@
 #include "base/time/time.h"
 #include "url/url_parse.h"
 
+namespace base {
+class CommandLine;
+}  // namespace base
+
 namespace password_manager {
 
 // Encapsulates a facet URI in canonical form.
@@ -154,6 +158,11 @@ struct AffiliatedFacetsWithUpdateTime {
 bool AreEquivalenceClassesEqual(const AffiliatedFacets& a,
                                 const AffiliatedFacets& b);
 
+// Returns whether or not affiliation based matching is enabled, either via
+// command line flags or field trials. The command line flag, if present, always
+// takes precedence.
+bool IsAffiliationBasedMatchingEnabled(const base::CommandLine& command_line);
+
 }  // namespace password_manager
 
 #endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_AFFILIATION_UTILS_H_