Create compositor animations for effect animations in SPv2.
Further work needed to complete starting animation cc-side inclusive
of routing start time back to Blink.
Addition of direct compositing reason to EffectPaintProperyNode in this change
is lifted from
http://crrev.com/2581843002.
BUG=
674317
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Committed:
https://crrev.com/fbbcd30726ccc750fb8434b0992e7a006b106473
Cr-Commit-Position: refs/heads/master@{#440295}