Added system notification for update_engine.

chrome/browser/browser_init.cc

Index: chrome/browser/browser_init.cc
diff --git a/chrome/browser/browser_init.cc b/chrome/browser/browser_init.cc
index 7a651e5a320ba1aa8d86c2455e5b4b37e851a976..495ce1c493ce1593bfc17ed3323429676a29d6f6 100644
--- a/chrome/browser/browser_init.cc
+++ b/chrome/browser/browser_init.cc
@@ -78,6 +78,7 @@
 #include "chrome/browser/chromeos/network_message_observer.h"
 #include "chrome/browser/chromeos/network_state_notifier.h"
 #include "chrome/browser/chromeos/system_key_event_listener.h"
+#include "chrome/browser/chromeos/update_observer.h"
 #include "chrome/browser/chromeos/usb_mount_observer.h"
 #include "chrome/browser/chromeos/wm_message_listener.h"
 #include "chrome/browser/chromeos/wm_overview_controller.h"
@@ -432,6 +433,11 @@ bool BrowserInit::LaunchBrowser(
     chromeos::CrosLibrary::Get()->GetPowerLibrary()->AddObserver(
         low_battery_observer);
 
+    static chromeos::UpdateObserver* update_observer =
+        new chromeos::UpdateObserver(profile);
+    chromeos::CrosLibrary::Get()->GetUpdateLibrary()->AddObserver(
+        update_observer);
+
     static chromeos::NetworkMessageObserver* network_message_observer =
         new chromeos::NetworkMessageObserver(profile);
     chromeos::CrosLibrary::Get()->GetNetworkLibrary()->AddObserver(