MD Settings: Add "Show Google Now cards in the launcher" row in Search section.

chrome/browser/ui/webui/settings/search_engines_handler.h

 // Copyright 2016 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_UI_WEBUI_SETTINGS_SEARCH_ENGINES_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_SEARCH_ENGINES_HANDLER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 36 matching lines @@
                        const base::string16& title,
                        const base::string16& keyword,
                        const std::string& url) override;
 
   // SettingsPageUIHandler implementation.
   void RegisterMessages() override;
   void OnJavascriptAllowed() override;
   void OnJavascriptDisallowed() override;
 
  private:
-  // Retrieves all search engines and returns the to WebUI.
+  // Retrieves all search engines and returns them to WebUI.
   void HandleGetSearchEnginesList(const base::ListValue* args);
 
   std::unique_ptr<base::DictionaryValue> GetSearchEnginesList();
 
   // Removes the search engine at the given index. Called from WebUI.
   void HandleRemoveSearchEngine(const base::ListValue* args);
 
   // Sets the search engine at the given index to be default. Called from WebUI.
   void HandleSetDefaultSearchEngine(const base::ListValue* args);
 
@@ skipping 24 matching lines @@
       int index,
       bool is_default);
 
   // Returns a dictionary to pass to WebUI representing the extension.
   base::DictionaryValue* CreateDictionaryForExtension(
       const extensions::Extension& extension);
 
   // WebUI call to request a dictionary of hotword related properties.
   void HandleGetHotwordInfo(const base::ListValue* args);
 
+  // WebUI call to request the availability of Google Now cards.
+  void HandleGetGoogleNowAvailability(const base::ListValue* args);
+
   // Constructs a SearchPageHotwordInfo dictionary.
   std::unique_ptr<base::DictionaryValue> GetHotwordInfo();
 
   // Callback for HotwordService::AudioHistoryHandler::GetAudioHistoryEnabled.
   void OnGetHotwordAudioHistoryEnabled(
       std::unique_ptr<base::Value> callback_id,
       std::unique_ptr<base::DictionaryValue> status,
       bool success,
       bool logging_enabled);
 
@@ skipping 13 matching lines @@
   std::unique_ptr<EditSearchEngineController> edit_controller_;
   PrefChangeRegistrar pref_change_registrar_;
   base::WeakPtrFactory<SearchEnginesHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchEnginesHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SEARCH_ENGINES_HANDLER_H_