[Password Generation] Use signatures for form matching

components/autofill/content/public/interfaces/autofill_types.mojom

 // Copyright 2016 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.
 
 module autofill.mojom;
 
 import "mojo/common/common_custom_types.mojom";
 import "url/mojo/origin.mojom";
 import "url/mojo/url.mojom";
 
@@ skipping 132 matching lines @@
   // Keys for std::map<UsernamesCollectionKey, std::vector<base::string16>>
   array<UsernamesCollectionKey> other_possible_usernames_keys;
   // Values for std::map<UsernamesCollectionKey, std::vector<base::string16>>
   array<array<string>> other_possible_usernames_values;
   bool wait_for_username;
   bool is_possible_change_password_form;
 };
 
 // autofill::PasswordFormGenerationData
 struct PasswordFormGenerationData {
-  string name;
-  url.mojom.Url action;
-  FormFieldData generation_field;
+  uint64 form_signature;
+  uint32 field_signature;
 };
 
 // autofill::PasswordForm
 struct PasswordForm {
   PasswordFormScheme scheme;
   string signon_realm;
   url.mojom.Url origin_with_path;
   url.mojom.Url action;
   string affiliated_web_realm;
   string submit_element;
@@ skipping 35 matching lines @@
   array<PasswordFormFieldPredictionType> values;
 };
 
 // TODO(leonhsl): Use map directly after http://crbug.com/628104 solved.
 // autofill::FormsPredictionsMap
 // --> std::map<FormData, PasswordFormFieldPredictionMap>
 struct FormsPredictionsMap {
   array<FormData> keys;
   array<PasswordFormFieldPredictionMap> values;
 };