Predator and CL did not provide any possible suspects.
Using Code Search for the file, "AcceleratedImageBufferSurface.cpp" assigning to the concern owner.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/30a7f83076be71351b71dfcb6cefee6ec2a9faca

@ccameron -- 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 494001:494002.

Detailed report: https://clusterfuzz.com/testcase?key=5871683893460992

Fuzzer: inferno_webbot
Job Type: linux_ubsan_chrome
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  gr_context in AcceleratedImageBufferSurface.cpp
  blink::AcceleratedImageBufferSurface::AcceleratedImageBufferSurface
  _ZN4base10MakeUniqueIN5blink29AcceleratedImageBufferSurfaceEJRKNS1_7IntSizeERNS1
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_chrome&range=485549:485564
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_chrome&range=494001:494002

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5871683893460992

See https://github.com/google/clusterfuzz-tools 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 5871683893460992 is verified as fixed, so closing issue as verified.

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