[Autofill/Autocomplete Feature] Substring matching instead of prefix matching.

components/autofill/core/browser/suggestion.cc

 // Copyright 2014 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/suggestion.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "components/autofill/core/browser/autofill_profile.h"
 #include "components/autofill/core/browser/credit_card.h"
 
@@ skipping 11 matching lines @@
 SuggestionBackendID::~SuggestionBackendID() {
 }
 
 bool SuggestionBackendID::operator<(const SuggestionBackendID& other) const {
   if (variant != other.variant)
     return variant < other.variant;
   return guid < other.guid;
 }
 
 Suggestion::Suggestion()
-    : frontend_id(0) {
+    : frontend_id(0),
+      match(PREFIX_MATCH) {
 }
 
 Suggestion::Suggestion(const Suggestion& other)
     : backend_id(other.backend_id),
       frontend_id(other.frontend_id),
       value(other.value),
       label(other.label),
-      icon(other.icon) {
+      icon(other.icon),
+      match(other.match) {
 }
 
 Suggestion::Suggestion(const base::string16& v)
     : frontend_id(0),
-      value(v) {
+      value(v),
+      match(PREFIX_MATCH) {
 }
 
 Suggestion::Suggestion(const std::string& v,
                        const std::string& l,
                        const std::string& i,
                        int fid)
     : frontend_id(fid),
       value(base::UTF8ToUTF16(v)),
       label(base::UTF8ToUTF16(l)),
-      icon(base::UTF8ToUTF16(i)) {
+      icon(base::UTF8ToUTF16(i)),
+      match(PREFIX_MATCH) {
 }
 
 Suggestion::~Suggestion() {
 }
 
 }  // namespace autofill