Merge change 5854 into donut

* changes:
  Run backups at background priority
diff --git a/services/java/com/android/server/BackupManagerService.java b/services/java/com/android/server/BackupManagerService.java
index c67f0b5..ecdf926 100644
--- a/services/java/com/android/server/BackupManagerService.java
+++ b/services/java/com/android/server/BackupManagerService.java
@@ -626,6 +626,9 @@
         public void run() {
             if (DEBUG) Log.v(TAG, "Beginning backup of " + mQueue.size() + " targets");
 
+            // Backups run at background priority
+            Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
+
             // The package manager doesn't have a proper <application> etc, but since
             // it's running here in the system process we can just set up its agent
             // directly and use a synthetic BackupRequest.  We always run this pass