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Time intervals are inconsistent due to the event's timestamp being determined by the
OS once its free to process such event. This causes artifacts in the prediction,
specifically overshoot. In order to mitigate this, time intervals are fed into a
Kalman filter instead of being used directly.

Change-Id: Iec1050804939a56dea8b8593287351371a26ef81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1653650Reviewed-by: Ella Ge <eirage@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Luis Sanchez Padilla <lusanpad@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#671775}