Differentiate between system_server and unknown.

Bug: 5531966
Change-Id: I2b64b04f3f5a8760a2314729e8b90e9dd6699cb4
diff --git a/services/java/com/android/server/Watchdog.java b/services/java/com/android/server/Watchdog.java
index 2d3ac00..728fb26 100644
--- a/services/java/com/android/server/Watchdog.java
+++ b/services/java/com/android/server/Watchdog.java
@@ -451,7 +451,8 @@
             Thread dropboxThread = new Thread("watchdogWriteToDropbox") {
                     public void run() {
                         mActivity.addErrorToDropBox(
-                                "watchdog", null, null, null, name, null, stack, null);
+                                "watchdog", null, "system_server", null, null,
+                                name, null, stack, null);
                     }
                 };
             dropboxThread.start();