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This CL pushes the start/end scroll offset information through to the
compositor and updates the currentTime algorithm to make use of it.
Updates to the start/end scroll offset are wired through
blink::WorkletAnimation::UpdateOnCompositor, however the animation is
not invalidated yet if the scroller properties would change (e.g. due
to layout changing). This will be done in a follow-up CL.

Bug: 885196
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I67da2c1ef26b66314af5891a2356920164fa0b0f
Reviewed-on: https://chromium-review.googlesource.com/c/1271398
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602028}