[autofill] Add support for PSL domain matching for password autofill.

content/public/common/password_form.h

 // Copyright (c) 2011 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 CONTENT_PUBLIC_COMMON_PASSWORD_FORM_H__
 #define CONTENT_PUBLIC_COMMON_PASSWORD_FORM_H__
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 36 matching lines @@
     SCHEME_DIGEST,
     SCHEME_OTHER
   } scheme;
 
   // The "Realm" for the sign-on (scheme, host, port for SCHEME_HTML, and
   // contains the HTTP realm for dialog-based forms).
   // 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
+  // when two PasswordForms are matched when trying to find a login/pass pair
+  // for a site. It is only set to a non-empty value during a match of the
+  // original stored login/pass and the current observed form if all these
+  // statements are true:
+  // 1) The full signon_realm is not the same.
+  // 2) The registry controlled domain is the same. For example; foo.bar,
+  // m.foo.bar and www.foo.bar would all resolve to foo.bar if .bar is the
+  // public suffix.
+  // 3) The scheme is the same.
+  // 4) The port is the same.
+  // For example, if you have a password for http://www.foo.bar (where .bar is
+  // the public suffix) and the observed form is http://m.foo.bar,
+  // |original_signon_realm| must be set to http://www.foo.bar.
+  std::string original_signon_realm;
+
   // The URL (minus query parameters) containing the form. This is the primary
   // data used by the PasswordManager to decide (in longest matching prefix
   // fashion) whether or not a given PasswordForm result from the database is a
   // good fit for a particular form on a page, so it must not be empty.
   GURL origin;
 
   // The action target of the form. This is the primary data used by the
   // PasswordManager for form autofill; that is, the action of the saved
   // credentials must match the action of the form on the page to be autofilled.
   // If this is empty / not available, it will result in a "restricted"
@@ skipping 99 matching lines @@
   PasswordForm();
   ~PasswordForm();
 };
 
 // Map username to PasswordForm* for convenience. See password_form_manager.h.
 typedef std::map<string16, PasswordForm*> PasswordFormMap;
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_PASSWORD_FORM_H__