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AddMeasurement is the new API that will be used to support ad hoc
measurements collected by benchmarks.

This also helps clients remove their dependency from legacy Telemetry
values.

Bug: 999484
Change-Id: I7d03c3380ddc99dce27b2200009d824faca82c47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1780839Reviewed-by: Ravi Mistry <rmistry@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693642}