Sending autofill types for username fields in sign-in forms for improving username detection.

components/autofill/core/browser/autofill_manager.cc

 // 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.
 
 #include "components/autofill/core/browser/autofill_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1989 matching lines @@
 // static
 void AutofillManager::DeterminePossibleFieldTypesForUpload(
     const std::vector<AutofillProfile>& profiles,
     const std::vector<CreditCard>& credit_cards,
     const std::string& app_locale,
     FormStructure* submitted_form) {
   // For each field in the |submitted_form|, extract the value.  Then for each
   // profile or credit card, identify any stored types that match the value.
   for (size_t i = 0; i < submitted_form->field_count(); ++i) {
     AutofillField* field = submitted_form->field(i);
-    ServerFieldTypeSet matching_types;
+    ServerFieldTypeSet matching_types = field->possible_types();
 
     base::string16 value;
     base::TrimWhitespace(field->value, base::TRIM_ALL, &value);
 
     for (const AutofillProfile& profile : profiles)
       profile.GetMatchingTypes(value, app_locale, &matching_types);
     for (const CreditCard& card : credit_cards)
       card.GetMatchingTypes(value, app_locale, &matching_types);
 
     if (matching_types.empty())
@@ skipping 177 matching lines @@
 }
 #endif  // ENABLE_FORM_DEBUG_DUMP
 
 void AutofillManager::LogCardUploadDecisionUkm(
     AutofillMetrics::CardUploadDecisionMetric upload_decision) {
   AutofillMetrics::LogCardUploadDecisionUkm(
       client_->GetUkmService(), pending_upload_request_url_, upload_decision);
 }
 
 }  // namespace autofill