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This change instead updates the animation progress in delta-time
increments, which prevents a bunch of clock math and rewinding of start
timestamps.

Bug: None
Change-Id: I6848e3c3ca2d7c844f56f126d72c9b8420364b2a
Reviewed-on: https://chromium-review.googlesource.com/c/1356261
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613161}