Add an update warning for downloading over mobile data

chrome/browser/ui/webui/settings/about_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_ABOUT_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_ABOUT_HANDLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 90 matching lines @@
   void HandleGetChannelInfo(const base::ListValue* args);
   // Callbacks for version_updater_->GetChannel calls.
   void OnGetCurrentChannel(std::string callback_id,
                            const std::string& current_channel);
   void OnGetTargetChannel(std::string callback_id,
                           const std::string& current_channel,
                           const std::string& target_channel);
 
   // Checks for and applies update, triggered by JS.
   void HandleRequestUpdate(const base::ListValue* args);
+  // Checks for and applies update over cellular connection, triggered by JS.
+  // Target version and size should be included in the list of arguments.
+  void HandleRequestUpdateOverCellular(const base::ListValue* args);
 
 #endif
 
   // Checks for and applies update.
   void RequestUpdate();
 
+  // Checks for and applies update over cellular connection to the given target.
+  void RequestUpdateOverCellular(std::string& target_version,
+                                 int64_t target_size);
+
   // Callback method which forwards status updates to the page.
   void SetUpdateStatus(VersionUpdater::Status status,
                        int progress,
+                       const std::string& version,
+                       const int64_t size,
                        const base::string16& fail_message);
 
 #if defined(OS_MACOSX)
   // Callback method which forwards promotion state to the page.
   void SetPromotionState(VersionUpdater::PromotionState state);
 #endif
 
 #if defined(OS_CHROMEOS)
   void HandleGetRegulatoryInfo(const base::ListValue* args);
 
@@ skipping 19 matching lines @@
 
   // Used for callbacks.
   base::WeakPtrFactory<AboutHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AboutHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_ABOUT_HANDLER_H_