Add /data/misc/a11ytrace folder to store accessibility trace files.

Bug: 157601519
Test: adb shell cmd accessibility start-trace
      adb shell cmd accessibility stop-trace
Change-Id: Id4224cee800fe3e10f33794c96048366a0bf09bb
diff --git a/private/shell.te b/private/shell.te
index 0cdf43d..3ca8360 100644
--- a/private/shell.te
+++ b/private/shell.te
@@ -48,6 +48,12 @@
 # Allow shell to run adb shell cmd stats commands. Needed for CTS.
 binder_call(shell, statsd);
 
+# Allow shell to read and unlink traces stored in /data/misc/a11ytraces.
+userdebug_or_eng(`
+  allow shell accessibility_trace_data_file:dir rw_dir_perms;
+  allow shell accessibility_trace_data_file:file { r_file_perms unlink };
+')
+
 # Allow shell to read and unlink traces stored in /data/misc/perfetto-traces.
 allow shell perfetto_traces_data_file:dir rw_dir_perms;
 allow shell perfetto_traces_data_file:file { r_file_perms unlink };