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This CL enables collecting Chrome events through perfetto system tracing
in the power.mobile benchmark.

Bug: 1151840
Change-Id: Iac07d6f9705d264867738e741ad743c7949f29a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2553426Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#830528}