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Switch from the legacy JSON format to binary Perfetto traces (.pftrace)
in the mobile tracing UI. Perfetto traces can be viewed with the
Perfetto UI (https://ui.perfetto.dev) and converted back to JSON format
for the legacy Trace Viewer.

Bug: b/158460807
Change-Id: I2a2865717eb5bccee7545ea62b7f8d3a0f473366
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2292473
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Auto-Submit: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793259}