Add update available icon in system tray

chrome/browser/upgrade_detector.h

 // Copyright (c) 2011 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_UPGRADE_DETECTOR_H_
 #define CHROME_BROWSER_UPGRADE_DETECTOR_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/timer/timer.h"
@@ skipping 83 matching lines @@
     // If no update to Chrome has been installed for more than the recommended
     // time AND auto-update is turned off.
     UPGRADE_NEEDED_OUTDATED_INSTALL_NO_AU,
   };
 
   UpgradeDetector();
 
   // Sends out UPGRADE_RECOMMENDED notification and set notify_upgrade_.
   void NotifyUpgradeRecommended();
 
+  // The function that sends out a notification that lets the rest of the UI
+  // know we should notify the user that a new update is available to download
+  // over cellular connection.
+  void NotifyUpdateOverCellularAvailable();
+
   // Triggers a critical update, which starts a timer that checks the machine
   // idle state. Protected and virtual so that it could be overridden by tests.
   virtual void TriggerCriticalUpdate();
 
   UpgradeAvailable upgrade_available() const { return upgrade_available_; }
   void set_upgrade_available(UpgradeAvailable available) {
     upgrade_available_ = available;
   }
 
   void set_best_effort_experiment_updates_available(bool available) {
@@ skipping 58 matching lines @@
   UpgradeNotificationAnnoyanceLevel upgrade_notification_stage_;
 
   // Whether we have waited long enough after detecting an upgrade (to see
   // is we should start nagging about upgrading).
   bool notify_upgrade_;
 
   DISALLOW_COPY_AND_ASSIGN(UpgradeDetector);
 };
 
 #endif  // CHROME_BROWSER_UPGRADE_DETECTOR_H_