Allow perfetto traced_probes to poll /proc/{meminfo,stat,vmstat,...}
This allows the trace producer daemon to snapshot counters at high frequency in the trace. As usual for Perfetto, this data is NOT made available to arbitrary apps but only to an extremely limited subset of processes governed by selinux rules (currently shell and statsd). Bug: 115956288 Change-Id: I7e1bfda4b568b9bac9012b198ecbb998da4f773d
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