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This new class makes it easier to write tests for LegacyPageTest
implementations, and is compatible with the add hoc measurements that
they normally write.

Depends on catapult CL:
https://chromium-review.googlesource.com/c/catapult/+/1862517

Bug: 999484
Change-Id: I13c64fdf7cb7181ac34306a124868d408bc99742
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863292Reviewed-by: Ravi Mistry <rmistry@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706470}