Add update available icon in system tray

chrome/browser/chromeos/upgrade_detector_chromeos.cc

Index: chrome/browser/chromeos/upgrade_detector_chromeos.cc
diff --git a/chrome/browser/chromeos/upgrade_detector_chromeos.cc b/chrome/browser/chromeos/upgrade_detector_chromeos.cc
index ecc130b350f94676476f8b3746a1c9170d64d9d3..4178576bc484b20ffaa56b5c6b6771f0a9ff992d 100644
--- a/chrome/browser/chromeos/upgrade_detector_chromeos.cc
+++ b/chrome/browser/chromeos/upgrade_detector_chromeos.cc
@@ -92,15 +92,19 @@ void UpgradeDetectorChromeos::Shutdown() {
 
 void UpgradeDetectorChromeos::UpdateStatusChanged(
     const UpdateEngineClient::Status& status) {
-  if (status.status != UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT)
-    return;
-
-  upgrade_detected_time_ = base::Time::Now();
-
-  channels_requester_.reset(new UpgradeDetectorChromeos::ChannelsRequester());
-  channels_requester_->RequestChannels(
-      base::Bind(&UpgradeDetectorChromeos::OnChannelsReceived,
-                 weak_factory_.GetWeakPtr()));
+  if (status.status == UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT) {
+    upgrade_detected_time_ = base::Time::Now();
+
+    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() {