This looks like a duplicate of 855688 - there is console output, but the animation worklet is not starting.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8e33e9d2a04d284b061e024103dd36ba07daa32d

commit 8e33e9d2a04d284b061e024103dd36ba07daa32d
Author: Peter Mayo <petermayo@chromium.org>
Date: Thu Aug 09 14:34:12 2018

[BGPT] Allow new optimizations in layout tests

With --enable-blink-gen-property-trees we don't repaint invisible nodes
on the compositor, so we don't need to animate it, and so the console
output is not present, nor are other animated changes.  This is arguably
better, but was being tested for naively.

Bug:855691
Cq-Include-Trybots: luci.chromium.try:linux-blink-gen-property-trees;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I625f85710ec803eb5f3515a95d84b4cf7d6ac2d1
Reviewed-on: https://chromium-review.googlesource.com/1162075
Commit-Queue: Robert Flack <flackr@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>

[modify] https://crrev.com/8e33e9d2a04d284b061e024103dd36ba07daa32d/third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-gen-property-trees
[modify] https://crrev.com/8e33e9d2a04d284b061e024103dd36ba07daa32d/third_party/WebKit/LayoutTests/virtual/threaded/animations/compositor-independent-transform-cancel.html
[modify] https://crrev.com/8e33e9d2a04d284b061e024103dd36ba07daa32d/third_party/WebKit/LayoutTests/virtual/threaded/fast/animationworklet/animation-worklet-animator-animate.html
[modify] https://crrev.com/8e33e9d2a04d284b061e024103dd36ba07daa32d/third_party/WebKit/LayoutTests/virtual/threaded/fast/animationworklet/animation-worklet-animator-with-options.html
[modify] https://crrev.com/8e33e9d2a04d284b061e024103dd36ba07daa32d/third_party/WebKit/LayoutTests/virtual/threaded/fast/animationworklet/worklet-animation-currentTime.html

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/bad2ad666be598479b7b9fe8449416f37d2444b5

commit bad2ad666be598479b7b9fe8449416f37d2444b5
Author: Andrii Shyshkalov <tandrii@chromium.org>
Date: Thu Aug 09 19:17:36 2018

Revert "[BGPT] Allow new optimizations in layout tests"

This reverts commit 8e33e9d2a04d284b061e024103dd36ba07daa32d.

Reason for revert: Due to Gerrit outage  http://crbug.com/872722 , we are reverting this CL. Please, re-land it after all clear is given. If you have questions, please ask on the bug. Sorry for the inconvenience.

Original change's description:
> [BGPT] Allow new optimizations in layout tests
> 
> With --enable-blink-gen-property-trees we don't repaint invisible nodes
> on the compositor, so we don't need to animate it, and so the console
> output is not present, nor are other animated changes.  This is arguably
> better, but was being tested for naively.
> 
> Bug:855691
> Cq-Include-Trybots: luci.chromium.try:linux-blink-gen-property-trees;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: I625f85710ec803eb5f3515a95d84b4cf7d6ac2d1
> Reviewed-on: https://chromium-review.googlesource.com/1162075
> Commit-Queue: Robert Flack <flackr@chromium.org>
> Reviewed-by: Robert Flack <flackr@chromium.org>

TBR=petermayo@chromium.org,flackr@chromium.org,pdr@chromium.org

Change-Id: I648e25fd445fe9d2dc8f8f4056b7fd6d80abcdf4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug:  855691 
Cq-Include-Trybots: luci.chromium.try:linux-blink-gen-property-trees;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/1169791
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>

[modify] https://crrev.com/bad2ad666be598479b7b9fe8449416f37d2444b5/third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-gen-property-trees
[modify] https://crrev.com/bad2ad666be598479b7b9fe8449416f37d2444b5/third_party/WebKit/LayoutTests/virtual/threaded/animations/compositor-independent-transform-cancel.html
[modify] https://crrev.com/bad2ad666be598479b7b9fe8449416f37d2444b5/third_party/WebKit/LayoutTests/virtual/threaded/fast/animationworklet/animation-worklet-animator-animate.html
[modify] https://crrev.com/bad2ad666be598479b7b9fe8449416f37d2444b5/third_party/WebKit/LayoutTests/virtual/threaded/fast/animationworklet/animation-worklet-animator-with-options.html
[modify] https://crrev.com/bad2ad666be598479b7b9fe8449416f37d2444b5/third_party/WebKit/LayoutTests/virtual/threaded/fast/animationworklet/worklet-animation-currentTime.html

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f3263d96a2fd7568f410fbebc0ed7d6ea82e2897

commit f3263d96a2fd7568f410fbebc0ed7d6ea82e2897
Author: Peter Mayo <petermayo@chromium.org>
Date: Mon Aug 13 15:50:01 2018

[BGPT] Allow new optimizations in layout tests

With --enable-blink-gen-property-trees we don't repaint invisible nodes
on the compositor, so we don't need to animate it, and so the console
output is not present, nor are other animated changes.  This is arguably
better, but was being tested for naively.

This is a reland of 8e33e9d2a04d284b061e024103dd36ba07daa32d
> Change-Id: I625f85710ec803eb5f3515a95d84b4cf7d6ac2d1
> Reviewed-on: https://chromium-review.googlesource.com/1162075
> Commit-Queue: Robert Flack <flackr@chromium.org>
> Reviewed-by: Robert Flack <flackr@chromium.org>

Bug:  855691 
Change-Id: Idea876e956be546c1b35a0646de9260b9450592e
Cq-Include-Trybots: luci.chromium.try:linux-blink-gen-property-trees;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/1169932
Commit-Queue: Peter Mayo <petermayo@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582593}
[modify] https://crrev.com/f3263d96a2fd7568f410fbebc0ed7d6ea82e2897/third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-gen-property-trees
[modify] https://crrev.com/f3263d96a2fd7568f410fbebc0ed7d6ea82e2897/third_party/WebKit/LayoutTests/virtual/threaded/animations/composited-filter-webkit-filter.html
[modify] https://crrev.com/f3263d96a2fd7568f410fbebc0ed7d6ea82e2897/third_party/WebKit/LayoutTests/virtual/threaded/animations/compositor-independent-transform-cancel.html
[modify] https://crrev.com/f3263d96a2fd7568f410fbebc0ed7d6ea82e2897/third_party/WebKit/LayoutTests/virtual/threaded/fast/animationworklet/animation-worklet-animator-animate.html
[modify] https://crrev.com/f3263d96a2fd7568f410fbebc0ed7d6ea82e2897/third_party/WebKit/LayoutTests/virtual/threaded/fast/animationworklet/animation-worklet-animator-with-options.html
[modify] https://crrev.com/f3263d96a2fd7568f410fbebc0ed7d6ea82e2897/third_party/WebKit/LayoutTests/virtual/threaded/fast/animationworklet/worklet-animation-currentTime.html