GitLab

Makes ProducerClient::IsTracingActive() also consider active local
startup tracing sessions, and adds a test that verifies that system
tracing doesn't start until after local startup tracing is complete.

Bug: 1058461
Change-Id: I59a488e663ad9ac2aaa41ae4fef8990f3268b695
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087410
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Stephen Nusko <nuskos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747257}