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This is mostly an API change (*), the underlying implementation of
AddMeasurement is still the same (via legacy values in Telemetry), so
no behavior changes are expected.

(*) Except for a few measurement descriptions which were tweaked for
clarity.

Depends on:
https://chromium-review.googlesource.com/c/catapult/+/1840835

TBR=hablich@chromium.org

Bug: 999484
Change-Id: I01c79f1741dbbde6d179c33bb91defade8fd0155
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841551
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Auto-Submit: Juan Antonio Navarro Pérez <perezju@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705086}