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This was missing before, rendering the flag useless for non-browser
process tracing.

Change-Id: I49222c8582432b1ebe72695bca5d434f0097130f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877016
Auto-Submit: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709200}