[translate] Add translate ranker model loader.

ios/chrome/browser/translate/chrome_ios_translate_client.mm

 // 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 "ios/chrome/browser/translate/chrome_ios_translate_client.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/logging.h"
 #include "components/infobars/core/infobar.h"
 #include "components/prefs/pref_service.h"
 #include "components/translate/core/browser/page_translated_details.h"
 #include "components/translate/core/browser/translate_accept_languages.h"
 #include "components/translate/core/browser/translate_infobar_delegate.h"
 #include "components/translate/core/browser/translate_manager.h"
 #include "components/translate/core/browser/translate_prefs.h"
 #include "components/translate/core/browser/translate_step.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/infobars/infobar.h"
 #include "ios/chrome/browser/infobars/infobar_controller.h"
 #include "ios/chrome/browser/infobars/infobar_manager_impl.h"
 #include "ios/chrome/browser/pref_names.h"
 #import "ios/chrome/browser/translate/after_translate_infobar_controller.h"
 #import "ios/chrome/browser/translate/before_translate_infobar_controller.h"
 #import "ios/chrome/browser/translate/never_translate_infobar_controller.h"
 #include "ios/chrome/browser/translate/translate_accept_languages_factory.h"
 #import "ios/chrome/browser/translate/translate_message_infobar_controller.h"
+#include "ios/chrome/browser/translate/translate_ranker_factory.h"
 #include "ios/chrome/browser/translate/translate_service_ios.h"
 #include "ios/chrome/grit/ios_theme_resources.h"
 #include "ios/web/public/browser_state.h"
 #include "ios/web/public/web_state/web_state.h"
 #include "url/gurl.h"
 
 DEFINE_WEB_STATE_USER_DATA_KEY(ChromeIOSTranslateClient);
 
 ChromeIOSTranslateClient::ChromeIOSTranslateClient(web::WebState* web_state)
     : web::WebStateObserver(web_state),
-      translate_manager_(
-          new translate::TranslateManager(this, prefs::kAcceptLanguages)),
+      translate_manager_(new translate::TranslateManager(
+          this,
+          translate::TranslateRankerFactory::GetInstance()->GetForBrowserState(

[groby-ooo-7-16, 2017/01/23 21:41:57]

Will iOS actually utilize ranker? 

[Roger McFarlane (Chromium), 2017/02/08 23:08:14]

That's the plan. Should it not?

+              ios::ChromeBrowserState::FromBrowserState(
+                  web_state->GetBrowserState())),
+          prefs::kAcceptLanguages)),
       translate_driver_(web_state,
                         web_state->GetNavigationManager(),
                         translate_manager_.get()) {}
 
 ChromeIOSTranslateClient::~ChromeIOSTranslateClient() {
 }
 
 // static
 std::unique_ptr<translate::TranslatePrefs>
 ChromeIOSTranslateClient::CreateTranslatePrefs(PrefService* prefs) {
@@ skipping 96 matching lines @@
     const GURL& report_url) {
   NOTREACHED();
 }
 
 void ChromeIOSTranslateClient::WebStateDestroyed() {
   // Translation process can be interrupted.
   // Destroying the TranslateManager now guarantees that it never has to deal
   // with nullptr WebState.
   translate_manager_.reset();
 }