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We are going to turn proto trace generation on everywhere, but we are not
ready to run TBMv3 metrics on all platforms. This CL hides all the TBMv3
stuff behind a flag and sets this flag on linux-perf-fyi bot where we
test TBMv3 metrics.

Bug: 990304
Change-Id: I95f10acd6d287f5873e5c39755acde5ca0f007d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1980580Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#727267}