Accumulate updates to notifications before archiving.

By only adding notifications to the archive when they are
removed we batch up multiple updates and only store the
final version. Some data is lost in this process, but we
save tons of memory storing otherwise redundant /
uninteresting data (e.g. each step of a download).

Change-Id: I008afefc1242bb7c433d45da2c36fcc626dd3706
diff --git a/services/java/com/android/server/NotificationManagerService.java b/services/java/com/android/server/NotificationManagerService.java
index 1e394d6..9e036d1 100644
--- a/services/java/com/android/server/NotificationManagerService.java
+++ b/services/java/com/android/server/NotificationManagerService.java
@@ -1255,9 +1255,6 @@
                     sendAccessibilityEvent(notification, pkg);
                 }
 
-                // finally, keep some of this information around for later use
-                mArchive.record(n);
-
                 notifyPostedLocked(r);
             } else {
                 Slog.e(TAG, "Ignoring notification with icon==0: " + notification);
@@ -1472,6 +1469,9 @@
         if (mLedNotification == r) {
             mLedNotification = null;
         }
+
+        // Save it for users of getHistoricalNotifications()
+        mArchive.record(r.sbn);
     }
 
     /**