selinux policy for buffer queue config

Test: boot and check for no policy violations

Change-Id: I1ea2a79b9a45b503dcb061c196c5af1d0ddab653
diff --git a/private/property_contexts b/private/property_contexts
index 1197de3..2d5a127 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -235,3 +235,9 @@
 # Userspace reboot properties
 sys.userspace_reboot.log.         u:object_r:userspace_reboot_log_prop:s0
 persist.sys.userspace_reboot.log. u:object_r:userspace_reboot_log_prop:s0
+
+# Integer property which is used in libgui to configure the number of frames
+# tracked by buffer queue's frame event timing history. The property is set
+# by devices with video decoding pipelines long enough to overflow the default
+# history size.
+ro.lib_gui.frame_event_history_size u:object_r:bq_config_prop:s0