Implement PasswordStore::GetLoginsForSameOrganizationName.

components/password_manager/core/browser/psl_matching_helper.cc

Index: components/password_manager/core/browser/psl_matching_helper.cc
diff --git a/components/password_manager/core/browser/psl_matching_helper.cc b/components/password_manager/core/browser/psl_matching_helper.cc
index b4c4bef165c9d022f57ded82296fe6f68a8b88a0..6cbb305c7645938e4d3249378d76395273d84e7d 100644
--- a/components/password_manager/core/browser/psl_matching_helper.cc
+++ b/components/password_manager/core/browser/psl_matching_helper.cc
@@ -116,4 +116,28 @@ std::string GetRegistryControlledDomain(const GURL& signon_realm) {
       signon_realm,
       net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES);
 }
+
+std::string GetOrganizationIdentifyingName(const GURL& url) {
+  if (!url.is_valid())
+    return std::string();
+
+  const std::string organization_and_registrar =
+      net::registry_controlled_domains::GetDomainAndRegistry(
+          url, net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES);
+  const size_t registrar_length =
+      net::registry_controlled_domains::GetRegistryLength(
+          url, net::registry_controlled_domains::INCLUDE_UNKNOWN_REGISTRIES,
+          net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES);
+
+  if (organization_and_registrar.empty() || !registrar_length ||
+      registrar_length == std::string::npos) {
+    return std::string();
+  }
+
+  // No CHECK, std::string::substr gracefully handles an underflow there.
+  DCHECK_LT(registrar_length, organization_and_registrar.size());
+  return organization_and_registrar.substr(
+      0, organization_and_registrar.size() - registrar_length - 1);
+}
+
 }  // namespace password_manager