[ios] Enables the BuiltinProvider.

ios/chrome/browser/autocomplete/autocomplete_provider_client_impl.cc

 // Copyright 2015 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 "ios/chrome/browser/autocomplete/autocomplete_provider_client_impl.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "components/browser_sync/profile_sync_service.h"
 #include "components/history/core/browser/history_service.h"
 #include "components/keyed_service/core/service_access_type.h"
@@ skipping 101 matching lines @@
 std::string AutocompleteProviderClientImpl::GetAcceptLanguages() const {
   return browser_state_->GetPrefs()->GetString(prefs::kAcceptLanguages);
 }
 
 std::string
 AutocompleteProviderClientImpl::GetEmbedderRepresentationOfAboutScheme() {
   return kChromeUIScheme;
 }
 
 std::vector<base::string16> AutocompleteProviderClientImpl::GetBuiltinURLs() {
-  // iOS does not supports BuiltinProvider.
-  return std::vector<base::string16>();
+  std::vector<std::string> chrome_builtins(
+      kChromeHostURLs, kChromeHostURLs + kNumberOfChromeHostURLs);
+  std::sort(chrome_builtins.begin(), chrome_builtins.end());
+
+  std::vector<base::string16> builtins;
+  for (auto& url : chrome_builtins) {
+    builtins.push_back(base::ASCIIToUTF16(url));
+  }
+  return builtins;
 }
 
 std::vector<base::string16>
 AutocompleteProviderClientImpl::GetBuiltinsToProvideAsUserTypes() {
-  // iOS does not supports BuiltinProvider.
-  return std::vector<base::string16>();
+  return {base::ASCIIToUTF16(kChromeUIChromeURLsURL),
+          base::ASCIIToUTF16(kChromeUIVersionURL)};
 }
 
 bool AutocompleteProviderClientImpl::IsOffTheRecord() const {
   return browser_state_->IsOffTheRecord();
 }
 
 bool AutocompleteProviderClientImpl::SearchSuggestEnabled() const {
   return browser_state_->GetPrefs()->GetBoolean(prefs::kSearchSuggestEnabled);
 }
 
@@ skipping 20 matching lines @@
     const base::string16& term) {
   GetHistoryService()->DeleteMatchingURLsForKeyword(keyword_id, term);
 }
 
 void AutocompleteProviderClientImpl::PrefetchImage(const GURL& url) {}
 
 void AutocompleteProviderClientImpl::OnAutocompleteControllerResultReady(
     AutocompleteController* controller) {
   // iOS currently has no client for this event.
 }