[Password manager] Recognise squashed login+sign-up forms

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 41 matching lines @@
   // using basic or digest schemes. Default is SCHEME_HTML. Only PasswordForms
   // of the same Scheme will be matched/autofilled against each other.
   enum Scheme {
     SCHEME_HTML,
     SCHEME_BASIC,
     SCHEME_DIGEST,
     SCHEME_OTHER,
     SCHEME_LAST = SCHEME_OTHER
   } 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.
+    LAYOUT_OTHER,
+    // Login and signup forms combined in one <form>, to distinguish them from,
+    // e.g., change-password forms.
+    LAYOUT_LOGIN_AND_SIGNUP,
+    LAYOUT_LAST = LAYOUT_LOGIN_AND_SIGNUP
+  };
+
   // The "Realm" for the sign-on. This is scheme, host, port for SCHEME_HTML.
   // Dialog based forms also contain the HTTP realm. Android based forms will
   // contain a string of the form "android://<hash of cert>@<package name>"
   //
   // The signon_realm is effectively the primary key used for retrieving
   // data from the database, so it must not be empty.
   std::string signon_realm;
 
   // The original "Realm" for the sign-on (scheme, host, port for SCHEME_HTML,
   // and contains the HTTP realm for dialog-based forms). This realm is only set
@@ skipping 159 matching lines @@
   GURL avatar_url;
 
   // The URL of identity provider used for federated login.
   GURL federation_url;
 
   // If true, Chrome will not return this credential to a site in response to
   // 'navigator.credentials.request()' without user interaction.
   // Once user selects this credential the flag is reseted.
   bool skip_zero_click;
 
+  // The layout as determined during parsing. Default value is LAYOUT_OTHER.
+  Layout layout;
+
   // Returns true if this match was found using public suffix matching.
   bool IsPublicSuffixMatch() const;
 
   // Equality operators for testing.
   bool operator==(const PasswordForm& form) const;
   bool operator!=(const PasswordForm& form) const;
 
   PasswordForm();
   ~PasswordForm();
 };
 
 // Map username to PasswordForm* for convenience. See password_form_manager.h.
 typedef std::map<base::string16, PasswordForm*> PasswordFormMap;
 
 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 autofill::PasswordForm& form);
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_COMMON_PASSWORD_FORM_H__