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Enables perfetto service to emit clock snapshots when tracing Chrome.
This is required to correctly import traces specifying a clock other
than BOOTTIME (Android, Linux, Fuchsia).

Since perfetto snapshots all clocks, this requires relaxing the
syscall filter of the sandbox to also allow CLOCK_BOOTTIME &
CLOCK_MONOTONIC_RAW access.

Bug: 1018134
Change-Id: I98e9ffee97bda4381da7170d917c3bd83beecaff
TBR: hidehiko@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879894
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711670}