Fill android.sensor.timestamp for reprocess request

This CL fills android.sensor.timestamp field for reprocess request.

Bug: None
Test: cros_camera_service \
        --metadata_inspector_output=/dev/stdout \
        --metadata_inspector_whitelist='timestamp'

Change-Id: Id23890e7752dd51374801048185ddf059dc8e5b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1652753
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Commit-Queue: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672041}
2 files changed