AppOps: fix nested op tracking, new API to get apps using
permissions.

Change-Id: I20c7bd58febc01d6911a90440867eaacd133c464
diff --git a/services/java/com/android/server/AppOpsService.java b/services/java/com/android/server/AppOpsService.java
index aff994c..1712806 100644
--- a/services/java/com/android/server/AppOpsService.java
+++ b/services/java/com/android/server/AppOpsService.java
@@ -233,6 +233,7 @@
                         + " code " + code + " time=" + op.time + " duration=" + op.duration
                         + " nesting=" + op.nesting);
                 }
+                op.nesting = 0;
             } else {
                 op.nesting--;
             }