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To collect data about scroll jank, we run this experimental TBMv3
metric on those stories from system_health benchmark that involve
scrolling.

This is a part of an effort to identify the main sources of jank in
Chrome. See the doc for more info:
https://docs.google.com/document/d/1YycxFDEUSVUHVDKX3_zsCFuo07oCWOogbI0F7n6ATyY

Bug: b/150125501
Change-Id: I5c808f72952766267bf5ae0eca637df79acd2825
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062279
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745007}