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This metric is being useful to know if the canvas has been rendered.
There have been substantial changes last year, so extending it one more
year.

Bug: 1160786
Change-Id: Iffc8975de356760f0b5912a5fe5f0290884359d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2623953Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Juanmi Huertas <juanmihd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842793}