Updates language model on iOS.

components/translate/ios/browser/language_detection_controller.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 COMPONENTS_TRANSLATE_IOS_BROWSER_LANGUAGE_DETECTION_CONTROLLER_H_
 #define COMPONENTS_TRANSLATE_IOS_BROWSER_LANGUAGE_DETECTION_CONTROLLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 16 matching lines @@
 namespace web {
 class NavigationContext;
 class WebState;
 }
 
 namespace translate {
 
 class LanguageDetectionController : public web::WebStateObserver {
  public:
   // Language detection details, passed to language detection callbacks.
   struct DetectionDetails {

[martis, 2017/06/01 06:49:21]

Did you investigate reusing LanguageDetectionDetails from
components/translate/core/common/language_detection_details.h?

It might be too complex to unify the data types in this change, but we should
keep the possibility in mind.

[ramyasharma, 2017/06/02 07:20:24]

Yes, I did some basic investigation, and it looked too big a change for this CL.
Maybe I can look at it in the next CL? Have added a TODO.

+    DetectionDetails();
+    DetectionDetails(const DetectionDetails& other);
+    ~DetectionDetails();
+
     // The language detected by the content (Content-Language).
     std::string content_language;
 
     // The language written in the lang attribute of the html element.
     std::string html_root_language;
 
     // The adopted language.
     std::string adopted_language;
+
+    // The language detected by CLD.
+    std::string cld_language;
+
+    // Whether the CLD detection is reliable or not.
+    bool is_cld_reliable;
   };
 
   LanguageDetectionController(web::WebState* web_state,
                               JsLanguageDetectionManager* manager,
                               PrefService* prefs);
   ~LanguageDetectionController() override;
 
   // Callback types for language detection events.
   typedef base::Callback<void(const DetectionDetails&)> Callback;
   typedef base::CallbackList<void(const DetectionDetails&)> CallbackList;
@@ skipping 30 matching lines @@
   JsLanguageDetectionManager* js_manager_;
   BooleanPrefMember translate_enabled_;
   base::WeakPtrFactory<LanguageDetectionController> weak_method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LanguageDetectionController);
 };
 
 }  // namespace translate
 
 #endif  // COMPONENTS_TRANSLATE_IOS_BROWSER_LANGUAGE_DETECTION_CONTROLLER_H_