[translate] Add translate ranker model loader.

ios/chrome/browser/translate/chrome_ios_translate_client.mm

Index: ios/chrome/browser/translate/chrome_ios_translate_client.mm
diff --git a/ios/chrome/browser/translate/chrome_ios_translate_client.mm b/ios/chrome/browser/translate/chrome_ios_translate_client.mm
index 6338ae52f6c605f1b2ad8902fbe3a0107fe0e092..0c84729f62bab2541182ae0fe631e30455a2b25a 100644
--- a/ios/chrome/browser/translate/chrome_ios_translate_client.mm
+++ b/ios/chrome/browser/translate/chrome_ios_translate_client.mm
@@ -26,6 +26,7 @@
 #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"
@@ -36,8 +37,12 @@ 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()) {}