New thin layer of API extension chrome.i18n.detectLanguage

chrome/browser/extensions/api/i18n/i18n_api.h

 // Copyright (c) 2012 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_EXTENSIONS_API_I18N_I18N_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_I18N_I18N_API_H_
 
+#include <string>
+#include <vector>
+
 #include "chrome/browser/extensions/chrome_extension_function.h"
+#include "chrome/common/extensions/api/i18n.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
+#include "extensions/browser/extension_function.h"
+#include "third_party/cld_2/src/public/compact_lang_det.h"
+#include "third_party/cld_2/src/public/encodings.h"
 
 class Profile;
 
 namespace extensions {
 
 class I18nGetAcceptLanguagesFunction : public ChromeSyncExtensionFunction {
   ~I18nGetAcceptLanguagesFunction() override {}
   bool RunSync() override;
   DECLARE_EXTENSION_FUNCTION("i18n.getAcceptLanguages", I18N_GETACCEPTLANGUAGES)
 };
 
+class I18nDetectLanguageFunction : public UIThreadExtensionFunction {
+ private:
+  ~I18nDetectLanguageFunction() override{};
+
+  // UIThreadExtensionFunction:
+  ResponseAction Run() override;
+
+  scoped_ptr<base::ListValue> GetLanguage(const std::string& text);
+  void InitDetectedLanguages(
+      CLD2::Language* langs,
+      int* percent3,
+      std::vector<linked_ptr<
+          api::i18n::DetectLanguage::Results::Result::LanguagesType>>*
+          detected_langs);
+
+  DECLARE_EXTENSION_FUNCTION("i18n.detectLanguage", I18N_DETECTLANGUAGE)
+};
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_I18N_I18N_API_H_