Through code search on file synthetic_gesture_target_base.cc, suspected CL is 

https://chromium.googlesource.com/chromium/src/+/a9d9a6721c939076b6c688b137378f2c4b939eb9

lanwei@, could you please take a look?

My change is only to touch event, but your failure is to check MouseWheelEvent.
And my change has not been used so far, I just create some new classed, never been called so far.

https://codesearch.chromium.org/chromium/src/content/browser/renderer_host/input/synthetic_gesture_target_base.cc?q=PointIsWithinContents&sq=package:chromium&dr=CSs&l=70

ClusterFuzz has detected this issue as fixed in range 421508:421618.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6399492289200128

Fuzzer: inferno_layout_test_unmodified
Job Type: linux_asan_content_shell_drt
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  PointIsWithinContents(web_wheel.x, web_wheel.y). Mouse wheel position is not wit
  content::SyntheticGestureTargetBase::DispatchInputEventToPlatform
  content::SyntheticSmoothMoveGesture::ForwardMouseWheelInputEvents
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_asan_content_shell_drt&range=398573:398771
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_asan_content_shell_drt&range=421508:421618

Minimized Testcase (0.79 Kb): https://cluster-fuzz.appspot.com/download/AMIfv96LRP069J5GyHiNuydnxujW_xUCMPPf6ROMDItbcs4uXnQAMXPFgVF4b43T7dRoJ-eZrusQa3KRAY0ANHnvZrfXpFlLP6CrtA3HI39ODVQTyG9B63y757Sb3DI6eY846k6xGNvuXs8fE1t1rMg9F8Gs-Mmgpw?testcase_id=6399492289200128

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.

Removing EditIssue view restrictions from ClusterFuzz filed bugs. If you believe that this issue should still be restricted, please reapply the label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot