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

chrome/browser/translate/chrome_translate_client.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 "chrome/browser/translate/chrome_translate_client.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/strings/string_split.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #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"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/translate/translate_bubble_factory.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/theme_resources.h"
 #include "components/prefs/pref_service.h"
+#include "components/translate/core/browser/language_model.h"
 #include "components/translate/core/browser/language_state.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_download_manager.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/common/language_detection_details.h"
 #include "components/variations/service/variations_service.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "url/gurl.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(ChromeTranslateClient);
 
 ChromeTranslateClient::ChromeTranslateClient(content::WebContents* web_contents)
     : content::WebContentsObserver(web_contents),
       translate_driver_(&web_contents->GetController()),
       translate_manager_(
-          new translate::TranslateManager(this, prefs::kAcceptLanguages)) {
+          new translate::TranslateManager(this, prefs::kAcceptLanguages)),
+      language_model_(
+          LanguageModelFactory::GetInstance()->GetForBrowserContext(
+              web_contents->GetBrowserContext())) {
   translate_driver_.AddObserver(this);
   translate_driver_.set_translate_manager(translate_manager_.get());
 }
 
 ChromeTranslateClient::~ChromeTranslateClient() {
   translate_driver_.RemoveObserver(this);
 }
 
 translate::LanguageState& ChromeTranslateClient::GetLanguageState() {
   return translate_manager_->GetLanguageState();
@@ skipping 209 matching lines @@
 // ContentTranslateDriver::Observer implementation.
 
 void ChromeTranslateClient::OnLanguageDetermined(
     const translate::LanguageDetectionDetails& details) {
   // TODO: Remove translate notifications and have the clients be
   // ContentTranslateDriver::Observer directly instead.
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_TAB_LANGUAGE_DETERMINED,
       content::Source<content::WebContents>(web_contents()),
       content::Details<const translate::LanguageDetectionDetails>(&details));
+
+  // Unless we have no language model (e.g., in incognito), notify the model
+  // about detected language of every page visited.
+  if (language_model_ && details.is_cld_reliable)
+    language_model_->OnPageVisited(details.cld_language);
 }
 
 void ChromeTranslateClient::OnPageTranslated(
     const std::string& original_lang,
     const std::string& translated_lang,
     translate::TranslateErrors::Type error_type) {
   // TODO: Remove translate notifications and have the clients be
   // ContentTranslateDriver::Observer directly instead.
   DCHECK(web_contents());
   translate::PageTranslatedDetails details;
@@ skipping 37 matching lines @@
     if (GetLanguageState().InTranslateNavigation())
       return;
   }
 
   TranslateBubbleFactory::Show(browser->window(), web_contents(), step,
                                error_type);
 #else
   NOTREACHED();
 #endif
 }