The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/419241db11d4b1d1a7e516831f0ebf081960eb89

commit 419241db11d4b1d1a7e516831f0ebf081960eb89
Author: Stephen McGruer <smcgruer@chromium.org>
Date: Wed Oct 04 16:50:17 2017

Refactor cc::ElementAnimations to use AnimationTickers

This is a largely behavior-agnostic change that replaces ElementAnimations
use of AnimationPlayer with AnimationTicker. This allows a lot of pass-through
methods to be removed from AnimationPlayer.

Note that the flow of some method calls has changed, mostly to have AnimationPlayer
APIs called from AnimationTicker rather than calling into it and using the return
value. For example the AnimationPlayer::NotifyAnimationYYY methods are now called
from AnimationTicker.

Bug:  766915 
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I688c204f69785030330aa73be0c5707b4e5d3ce0
Reviewed-on: https://chromium-review.googlesource.com/655221
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506416}
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/animation/animation_host.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/animation/animation_player.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/animation/animation_player.h
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/animation/animation_player_unittest.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/animation/animation_ticker.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/animation/animation_ticker.h
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/animation/animation_timeline.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/animation/element_animations.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/animation/element_animations.h
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/animation/element_animations_unittest.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/test/animation_test_common.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/test/animation_test_common.h
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/test/animation_timelines_test_common.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/test/animation_timelines_test_common.h
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/test/layer_tree_test.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/trees/layer_tree_host_common_unittest.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/cc/trees/layer_tree_host_unittest_animation.cc
[modify] https://crrev.com/419241db11d4b1d1a7e516831f0ebf081960eb89/ui/compositor/layer_unittest.cc