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This CL adds a UseCounter for HTMLCanvas lowLatency use cases, to
complement said experiment, see the feature entry in
https://www.chromestatus.com/feature/6360971442388992

Bug: 895907
Change-Id: I7e81c4f317816b301d0845fc4561c8966000db36
Reviewed-on: https://chromium-review.googlesource.com/c/1293557Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601605}