The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/93761025e47b61ff2e36987fbb295e8d2682dc00

commit 93761025e47b61ff2e36987fbb295e8d2682dc00
Author: Stephen McGruer <smcgruer@chromium.org>
Date: Mon Feb 26 18:44:24 2018

Implement KeyframeEffect::setKeyframes()

This CL implements most of the setKeyframes() algorithm from the
web-animations spec[0]. The major missing piece is a lack of support
for altering CSS transitions; adding that will likely require us to
re-think the CSS transition stack.

Bug: 799061
Change-Id: Ie82746681b499f774f26daecbaafa39e072ee40d
Reviewed-on: https://chromium-review.googlesource.com/848037
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539209}
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/LayoutTests/external/wpt/web-animations/interfaces/KeyframeEffect/idlharness-expected.txt
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/LayoutTests/external/wpt/web-animations/interfaces/KeyframeEffect/setKeyframes-expected.txt
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/LayoutTests/platform/mac-mac10.12/external/wpt/web-animations/interfaces/KeyframeEffect/idlharness-expected.txt
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/LayoutTests/platform/win/external/wpt/web-animations/interfaces/KeyframeEffect/idlharness-expected.txt
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/LayoutTests/virtual/stable/web-animations-api/partial-keyframes-unsupported.html
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/Source/core/animation/EffectInput.cpp
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/Source/core/animation/EffectInput.h
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/Source/core/animation/KeyframeEffect.cpp
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/Source/core/animation/KeyframeEffect.h
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/Source/core/animation/KeyframeEffect.idl
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/Source/core/animation/KeyframeEffectModel.cpp
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/Source/core/animation/KeyframeEffectModel.h
[modify] https://crrev.com/93761025e47b61ff2e36987fbb295e8d2682dc00/third_party/WebKit/Source/core/animation/KeyframeEffectTest.cpp

Dropping to assigned as I am not currently looking at doing CSS Transition support here.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5f7b4c115a571f47ebe484ae1382d95fc5418018

commit 5f7b4c115a571f47ebe484ae1382d95fc5418018
Author: Stephen McGruer <smcgruer@chromium.org>
Date: Fri Apr 27 20:20:59 2018

Make KeyframeEffectReadOnly::setKeyframes take effect immediately

Previously we wouldn't notice that the keyframes had changed until the
next animation update. This CL fixes that by clearing any cached sampled
effects and notifying the owning Animation that it needs to invalidate
it's information.

This also fixes updating composited animations; invalidating the effect
on the animation causes us to properly restart the composited animation.

Bug: 799061,  835824 
Change-Id: Ib307a5409c52c5dab1ee0f98c989d7dbaef42937
Reviewed-on: https://chromium-review.googlesource.com/1026700
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554484}
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/WebKit/LayoutTests/external/wpt/web-animations/interfaces/KeyframeEffect/setKeyframes-expected.txt
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/WebKit/LayoutTests/external/wpt/web-animations/interfaces/KeyframeEffect/setKeyframes.html
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/blink/renderer/core/animation/animation.cc
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/blink/renderer/core/animation/animation.h
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/blink/renderer/core/animation/animation_effect.cc
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/blink/renderer/core/animation/animation_effect.h
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/blink/renderer/core/animation/animation_effect_owner.h
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/blink/renderer/core/animation/animation_effect_test.cc
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/blink/renderer/core/animation/animation_test.cc
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/blink/renderer/core/animation/keyframe_effect.cc
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/blink/renderer/core/animation/keyframe_effect.h
[modify] https://crrev.com/5f7b4c115a571f47ebe484ae1382d95fc5418018/third_party/blink/renderer/modules/animationworklet/worklet_animation.h

I don't plan to do any more work on this in the near future (most important would be CSS transition support), so dropping to available.