ash: Update system update notification behaviour.

chrome/browser/upgrade_detector.h

Index: chrome/browser/upgrade_detector.h
diff --git a/chrome/browser/upgrade_detector.h b/chrome/browser/upgrade_detector.h
index 3921426fe6c8c3b6c3c0acfbf64004c593165fea..778268756fae175e70c398ccf94a0bded8c2313d 100644
--- a/chrome/browser/upgrade_detector.h
+++ b/chrome/browser/upgrade_detector.h
@@ -75,6 +75,10 @@ class UpgradeDetector {
   // within the wrench menu.
   int GetIconResourceID(UpgradeNotificationIconType type);
 
+  UpgradeNotificationAnnoyanceLevel upgrade_notification_stage() const {
+    return upgrade_notification_stage_;
+  }
+
  protected:
   UpgradeDetector();