Predator and CL could not provide any possible suspects.
Using Code Search for the file, "motion_event_pump.cc" assigning to the concern owner who might be related.

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/4cd3f707add7024916ab41cf0b681f7f7d0d8c1f

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

This issue existed long before my CL was landed since this issue was filed on May 30, 2017 and my CL was landed on August 25, 2017. So I changed this issue to be available.

Predator and CL could not provide any possible suspects.
Using the code search for the file, “task_annotator.cc” assigning to concern owner from GIT revision log.
Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/60358094ba966ef30f1bcc446aa2c4afbdc1b4ac

@tzik -- Could you please look into this issue, kindly reassign if it has nothing to do with your changes.
Thank You.

Unable to provide possible suspect using Predator, CL and Code Search.
Could someone please look into the issue.
Thank You.

Automatically applying components based on information from OWNERS files. If this seems incorrect, please apply the Test-Predator-Wrong-Components label.

https://chromium-review.googlesource.com/#/c/chromium/src/+/695873 should resolve this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9f68ff4d6110c632f087c3ba0fb66abe1b9f1fc3

commit 9f68ff4d6110c632f087c3ba0fb66abe1b9f1fc3
Author: Reilly Grant <reillyg@chromium.org>
Date: Fri Oct 06 21:19:29 2017

Prevent crash when sending fake sensor data

If there is no currently registered event listener then there is nothing
to notify when a fake sensor event is reported. This resolves a crash
discovered by ClusterFuzz when mangling existing LayoutTests. This issue
is not reproducible by normal web content.

Bug:  727936 ,  757831 
Change-Id: I4ea874b9e738f94a4a2e5b2b20cd2f3124242ddc
Reviewed-on: https://chromium-review.googlesource.com/695873
Reviewed-by: Tim Volodine <timvolodine@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#507180}
[modify] https://crrev.com/9f68ff4d6110c632f087c3ba0fb66abe1b9f1fc3/content/renderer/device_sensors/device_motion_event_pump.cc
[modify] https://crrev.com/9f68ff4d6110c632f087c3ba0fb66abe1b9f1fc3/content/renderer/device_sensors/device_orientation_event_pump.cc

ClusterFuzz has detected this issue as fixed in range 507174:507213.

Detailed report: https://clusterfuzz.com/testcase?key=5529115162836992

Fuzzer: inferno_layout_test_unmodified
Job Type: mac_asan_content_shell
Platform Id: mac

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
  content::DeviceMotionEventPump::SendFakeDataForTesting
  base::debug::TaskAnnotator::RunTask
  blink::scheduler::TaskQueueManager::ProcessTaskFromWorkQueue
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=mac_asan_content_shell&range=338204:338244
Fixed: https://clusterfuzz.com/revisions?job=mac_asan_content_shell&range=507174:507213

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5529115162836992

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 5529115162836992 is verified as fixed, so closing issue as verified.

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