Add tag "foo" to builder test's notifications.

This allows them to be conveniently cleared via adb:

  $ adb shell service call notification 5 \
    s16 com.android.statusbartest \
	s16 foo \
	i32 <NOTIFICATIONID> \
	i32 <USERID>

Bug: 8564511
Change-Id: I9fae5a4a0be64d6707cc06ca938adeb8b3c0b735

tests/StatusBar/src/com/android/statusbartest/NotificationBuilderTest.java

@@ -49,6 +49,8 @@ public class NotificationBuilderTest extends Activity
 {
     private final static String TAG = "NotificationTestList";
 
+    private final static String NOTIFY_TAG = "foo";
+
     NotificationManager mNM;
     Handler mHandler;
     int mStartDelay;
@@ -196,7 +198,7 @@ public class NotificationBuilderTest extends Activity
         final Notification n = buildNotification(id);
         mHandler.postDelayed(new Runnable() {
             public void run() {
-                mNM.notify(id, n);
+                mNM.notify(NOTIFY_TAG, id, n);
             }
         }, mStartDelay);
     }