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The flag could be used along with perfetto-output-file flag.

Change-Id: Idd1c7069a0e2e29b3c33d60da02434c8b01af1ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774039
Commit-Queue: ssid <ssid@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691772}