Predator and CL did not provide any possible suspects.
Using Code Search for the file, "SkBitmapProcState_opts_SSE2.cpp" assigning to the concern onwer.

Suspecting Commit#
https://skia.git.corp.google.com/skia.git/+/9953737bcf885a52c08ade6c503f2202e4dd9aa5#

@fmalita -- 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 485152:485153.

Detailed report: https://clusterfuzz.com/testcase?key=5089980381921280

Fuzzer: ifratric-browserfuzzer-v3
Job Type: linux_ubsan_chrome
Platform Id: linux

Crash Type: Integer-overflow
Crash Address: 
Crash State:
  ClampX_ClampY_nofilter_affine_SSE2
  BitmapProcShaderContext::shadeSpan
  SkARGB32_Shader_Blitter::blitAntiH
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_chrome&range=419707:419720
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_chrome&range=485152:485153

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5089980381921280


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 5089980381921280 is verified as fixed, so closing issue.

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