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Add AnimationThroughputReporter to report throughput for layer
animations. To use it, create an instance with relevant LayerAniamtor
and a report callback when setting up animations. The callback will
be invoked after animation finishes if there is enough data and no
animation is aborted.

Bug: 1021774
Change-Id: Ib3029671660c58c29308f7ab2f02052f6ae94b29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2055691Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770649}