vold: Give logwrapper the ability to put jobs into the background sched group.

   Also set disk check/format execution to background.

Signed-off-by: San Mehat <san@google.com>
diff --git a/vold/logwrapper.h b/vold/logwrapper.h
index 602e24c..bf28aae 100644
--- a/vold/logwrapper.h
+++ b/vold/logwrapper.h
@@ -19,5 +19,5 @@
 #define _LOGWRAPPER_H
 
 #include <stdlib.h>
-int logwrap(int argc, char* argv[]);
+int logwrap(int argc, char* argv[], int background);
 #endif