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

chrome/browser/translate/chrome_translate_client.h

 // 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.
 
 #ifndef CHROME_BROWSER_TRANSLATE_CHROME_TRANSLATE_CLIENT_H_
 #define CHROME_BROWSER_TRANSLATE_CHROME_TRANSLATE_CLIENT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 11 matching lines @@
 class WebContents;
 }  // namespace content
 
 namespace test {
 class ScopedCLDDynamicDataHarness;
 }  // namespace test
 
 class PrefService;
 
 namespace translate {
+class LanguageModel;
 class LanguageState;
 class TranslateAcceptLanguages;
 class TranslatePrefs;
 class TranslateManager;
 }  // namespace translate
 
 class ChromeTranslateClient
     : public translate::TranslateClient,
       public translate::ContentTranslateDriver::Observer,
       public content::WebContentsObserver,
@@ skipping 73 matching lines @@
   // content::WebContentsObserver implementation.
   void WebContentsDestroyed() override;
 
   // Shows the translate bubble.
   void ShowBubble(translate::TranslateStep step,
                   translate::TranslateErrors::Type error_type);
 
   translate::ContentTranslateDriver translate_driver_;
   std::unique_ptr<translate::TranslateManager> translate_manager_;
 
+  // Model to be notified about detected language of every page visited. Not
+  // owned here.
+  translate::LanguageModel* language_model_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeTranslateClient);
 };
 
 #endif  // CHROME_BROWSER_TRANSLATE_CHROME_TRANSLATE_CLIENT_H_