Assigning to the concern owner from Predator results --
The result is a list of CLs that change the crashed files. 

Author: weiliangc
Project: chromium
Changelist: https://chromium.googlesource.com/chromium/src/+/b1e280d1a61f77855418913417c941c7faff176c
Time: Tue Apr 25 16:19:41 2017
Files animation_player.cc, property_tree.cc are changed in this cl (and is part of stack frame #4, "cc::AnimationPlayer::TickAnimations"; frame #5, "cc::AnimationPlayer::Tick")
Minimum distance from crash line to modified line: 47. (file: animation_player.cc, crashed on: 755, modified: 802).

@weiliangc -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

ClusterFuzz has detected this issue as fixed in range 473029:473088.

Detailed report: https://clusterfuzz.com/testcase?key=5160076255166464

Fuzzer: dstockwell-anim-gen
Job Type: windows_asan_chrome
Platform Id: windows

Crash Type: Null-dereference READ
Crash Address: 0x0000000c
Crash State:
  cc::EffectTree::OnOpacityAnimated
  cc::LayerTreeImpl::SetOpacityMutated
  cc::LayerTreeHostImpl::SetElementOpacityMutated
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=windows_asan_chrome&range=467000:467029
Fixed: https://clusterfuzz.com/revisions?job=windows_asan_chrome&range=473029:473088

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5160076255166464


See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 5160076255166464 is verified as fixed, so closing issue.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.