Autofill server-side heuristics for 2 fields password form

components/autofill/core/common/autofill_constants.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.
 
 // Contains constants specific to the Autofill component.
 
 #ifndef COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_CONSTANTS_H_
 #define COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_CONSTANTS_H_
 
 #include <stddef.h>         // For size_t
 
 namespace autofill {
 
 // Help URL for the Autofill dialog.
 extern const char kHelpURL[];
 
 // The number of fields required by Autofill to execute its heuristic and
 // crowdsourcing prediction routines. Ideally we would execute those routines no
 // matter how many fields are in the forms; however, finding the label for each
 // field is a costly operation and we can't spare the cycles if it's not
 // necessary.
 const size_t kRequiredFieldsForPredictionRoutines = 3;
 
 // The minimum number of fields required to upload a form to the Autofill
 // servers.
 const size_t kRequiredFieldsForUpload = 3;
 
+// The minimum number of fields in a form that contains only password fields to
+// upload the form to and request predictions from the Autofill servers.
+const size_t kRequiredFieldsForFormsWithOnlyPasswordFields = 2;
+
 // Options bitmask values for AutofillHostMsg_ShowPasswordSuggestions IPC
 enum ShowPasswordSuggestionsOptions {
   SHOW_ALL = 1 << 0 /* show all credentials, not just ones matching username */,
   IS_PASSWORD_FIELD = 1 << 1 /* input field is a password field */
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_CONSTANTS_H_