Merge "SystemServer: Looper's getMainLooper to return ServerThread"

Author: Dianne Hackborn

services/java/com/android/server/SystemServer.java

@@ -79,7 +79,7 @@ public void run() {
         EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_SYSTEM_RUN,
             SystemClock.uptimeMillis());
 
-        Looper.prepare();
+        Looper.prepareMainLooper();
 
         android.os.Process.setThreadPriority(
                 android.os.Process.THREAD_PRIORITY_FOREGROUND);