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Choosing how many render intervals a given frame needs to be shown
is very much like drawing a line on a 2D pixel grid.
That’s why this algorithm is inspired by Bresenham's line algorithm,
although it is simpler for using FP arithmetic.

It's gated by a feature switch and intended for lab tests and
later maybe a canary\beta experiment.

Bug: 1042111
Change-Id: I1d4e54252d904dd80f37e4542aa4b6950a527c4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1994546Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Eugene Zemtsov <eugene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732281}