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The OT infrastrucutre requires a single UseCounter to measure. This adds
a use counter for RequestLightProbe, which must be gotten before either
of the other Light Estimation API methods can be used.

Bug: 1148871
Change-Id: Ic9ac4b81fca1460497d4ff0753b7ceadcb982dd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538132
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Piotr Bialecki <bialpio@chromium.org>
Auto-Submit: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Piotr Bialecki <bialpio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827407}