Blink Compositor Animation: Make Animation and Curve methods non-virtual.
In unit tests for blink/cc integration: Erase gmock usage, check platform compositor data instead.
This will allow us to erase CompositorFactory.
BUG=
577016
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
Committed:
https://crrev.com/d30a199df83684947548304937ce3ca440a53811
Cr-Commit-Position: refs/heads/master@{#397426}