Add update available icon in system tray

chrome/browser/chromeos/upgrade_detector_chromeos.cc

 // 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.
 
 #include "chrome/browser/chromeos/upgrade_detector_chromeos.h"
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/memory/singleton.h"
@@ skipping 74 matching lines @@
 
 void UpgradeDetectorChromeos::Shutdown() {
   // Init() may not be called from tests.
   if (!initialized_)
     return;
   DBusThreadManager::Get()->GetUpdateEngineClient()->RemoveObserver(this);
 }
 
 void UpgradeDetectorChromeos::UpdateStatusChanged(
     const UpdateEngineClient::Status& status) {
-  if (status.status != UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT)
-    return;
+  if (status.status == UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT) {
+    upgrade_detected_time_ = base::Time::Now();
 
-  upgrade_detected_time_ = base::Time::Now();
-
-  channels_requester_.reset(new UpgradeDetectorChromeos::ChannelsRequester());
-  channels_requester_->RequestChannels(
-      base::Bind(&UpgradeDetectorChromeos::OnChannelsReceived,
-                 weak_factory_.GetWeakPtr()));
+    channels_requester_.reset(new UpgradeDetectorChromeos::ChannelsRequester());
+    channels_requester_->RequestChannels(
+        base::Bind(&UpgradeDetectorChromeos::OnChannelsReceived,
+                   weak_factory_.GetWeakPtr()));
+  } else if (status.status ==
+             UpdateEngineClient::UPDATE_STATUS_NEED_PERMISSION_TO_UPDATE) {
+    // Update engine broadcasts this state only when update is available but
+    // downloading over cellular connection requires user's agreement
+    NotifyUpdateOverCellularAvailable();
+  }
 }
 
 void UpgradeDetectorChromeos::NotifyOnUpgrade() {
   base::TimeDelta delta = base::Time::Now() - upgrade_detected_time_;
   int64_t time_passed = delta.InDays();
 
   const int kSevereThreshold = 7;
   const int kHighThreshold = 4;
   const int kElevatedThreshold = 2;
   const int kLowThreshold = 0;
@@ skipping 39 matching lines @@
 
 // static
 UpgradeDetectorChromeos* UpgradeDetectorChromeos::GetInstance() {
   return base::Singleton<UpgradeDetectorChromeos>::get();
 }
 
 // static
 UpgradeDetector* UpgradeDetector::GetInstance() {
   return UpgradeDetectorChromeos::GetInstance();
 }