Support Android username-only credentials.

components/autofill/core/common/password_form.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_AUTOFILL_CORE_COMMON_PASSWORD_FORM_H__
 #define COMPONENTS_AUTOFILL_CORE_COMMON_PASSWORD_FORM_H__
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 35 matching lines @@
     NO_SIGNAL_SENT,
     POSITIVE_SIGNAL_SENT,
     NEGATIVE_SIGNAL_SENT,
     // Reserve a few values for future use.
     UNKNOWN_STATUS = 10
   };
 
   // Enum to differentiate between HTML form based authentication, and dialogs
   // using basic or digest schemes. Default is SCHEME_HTML. Only PasswordForms
   // of the same Scheme will be matched/autofilled against each other.
-  enum Scheme {
+  enum Scheme : int {
     SCHEME_HTML,
     SCHEME_BASIC,
     SCHEME_DIGEST,
     SCHEME_OTHER,
-    SCHEME_LAST = SCHEME_OTHER
+    SCHEME_USERNAME_ONLY,
+
+    SCHEME_LAST = SCHEME_USERNAME_ONLY
   } scheme;
 
   // During form parsing, Chrome tries to partly understand the type of the form
   // based on the layout of its fields. The result of this analysis helps to
   // treat the form correctly once the low-level information is lost by
   // converting the web form into a PasswordForm. It is only used for observed
   // HTML forms, not for stored credentials.
   enum class Layout {
     // Forms which either do not need to be classified, or cannot be classified
     // meaningfully.
@@ skipping 230 matching lines @@
 typedef std::map<base::string16, const PasswordForm*> ConstPasswordFormMap;
 
 // For testing.
 std::ostream& operator<<(std::ostream& os, PasswordForm::Layout layout);
 std::ostream& operator<<(std::ostream& os, const PasswordForm& form);
 std::ostream& operator<<(std::ostream& os, PasswordForm* form);
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_COMMON_PASSWORD_FORM_H__