Add LanguageModel, a keyed service that collects language info from CLD.

chrome/browser/translate/chrome_translate_client.cc

Index: chrome/browser/translate/chrome_translate_client.cc
diff --git a/chrome/browser/translate/chrome_translate_client.cc b/chrome/browser/translate/chrome_translate_client.cc
index bdda1de254536448ee35fd55d8be6d16749dd866..a038061bd16fa09a2acbd2ace511a1ce8e404cc4 100644
--- a/chrome/browser/translate/chrome_translate_client.cc
+++ b/chrome/browser/translate/chrome_translate_client.cc
@@ -14,6 +14,7 @@
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/translate/language_model_factory.h"
 #include "chrome/browser/translate/translate_accept_languages_factory.h"
 #include "chrome/browser/translate/translate_service.h"
 #include "chrome/browser/ui/browser.h"
@@ -45,9 +46,13 @@ DEFINE_WEB_CONTENTS_USER_DATA_KEY(ChromeTranslateClient);
 ChromeTranslateClient::ChromeTranslateClient(content::WebContents* web_contents)
     : content::WebContentsObserver(web_contents),
       translate_driver_(&web_contents->GetController()),
+      language_model_observer_(
+          LanguageModelFactory::GetInstance()->GetForBrowserContext(
+              web_contents->GetBrowserContext())),
       translate_manager_(
           new translate::TranslateManager(this, prefs::kAcceptLanguages)) {
   translate_driver_.AddObserver(this);
+  translate_driver_.AddObserver(&language_model_observer_);

[droger, 2016/10/05 13:11:32]

Need to call RemoveObserver at some point.

Maybe use base::ScopedObserver?

[jkrcal, 2016/10/05 15:14:46]

Fixed by removing the observer completely (and using |this| instead).

   translate_driver_.set_translate_manager(translate_manager_.get());
 }