[Autofill] Always show available data when encountering autocomplete attributes

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.  Ideally we could send the forms
-// to Autofill 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.
-extern const size_t kRequiredAutofillFields;
+// 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;
 
 // 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_