Automatically applying components based on crash stacktrace and information from OWNERS files.

If this is incorrect, please apply the Test-Predator-Wrong-Components label.

Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/1b2f95835607dbb9c6021df8893fb18f4c7aee9e (Create new EventHandler and base class for EventListener/EventHandler).

If this is incorrect, please let us know why and apply the Test-Predator-Wrong-CLs label. If you aren't the correct owner for this issue, please unassign yourself as soon as possible so it can be re-triaged.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f594c634639b4524dab11fee8dac11f34bf88671

commit f594c634639b4524dab11fee8dac11f34bf88671
Author: Yuki Yamada <yukiy@google.com>
Date: Wed Oct 10 06:47:13 2018

Add an early return for null target

On dispatching an event, current implementation of
blink::Event::target() can return null while standard says that target
should not be null.
This CL's modification is just temporary bug fix, so this issue should
be addressed in other CLs.

Bug:  893449 ,  892970 
Change-Id: I4aaa94f14e12e9100ad901ce1b7bc23230792495
Reviewed-on: https://chromium-review.googlesource.com/c/1270596
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Yuki Yamada <yukiy@google.com>
Cr-Commit-Position: refs/heads/master@{#598232}
[modify] https://crrev.com/f594c634639b4524dab11fee8dac11f34bf88671/third_party/blink/renderer/bindings/core/v8/js_based_event_listener.cc

ClusterFuzz has detected this issue as fixed in range 598227:598237.

Detailed report: https://clusterfuzz.com/testcase?key=5641307144585216

Fuzzer: inferno_twister
Job Type: linux_msan_content_shell_drt
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
  blink::JSBasedEventListener::handleEvent
  blink::EventTarget::FireEventListeners
  blink::EventTarget::FireEventListeners
  
Sanitizer: memory (MSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_msan_content_shell_drt&range=597043:597056
Fixed: https://clusterfuzz.com/revisions?job=linux_msan_content_shell_drt&range=598227:598237

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5641307144585216

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 5641307144585216 is verified as fixed, so closing issue as verified.

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

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/183dcec54bb0e630814f54638a0d862da7315029

commit 183dcec54bb0e630814f54638a0d862da7315029
Author: Hayato Ito <hayato@chromium.org>
Date: Mon Nov 05 04:14:52 2018

Don't dispatch an event in DispatchEventToAOMEventListeners if event's target is null

This is a kind of follow-up CL of https://crrev.com/c/1270596.
It would be better to fix the root cause, instead of early return in
JSBasedEventListener::handleEvent.

Accessibility folks might want to look further to decide what we should do
if event's target can't be set there.

Bug:  892970 
Change-Id: Ic2a14242c611133df68cfc3ec6e24cb9d20bf214
Reviewed-on: https://chromium-review.googlesource.com/c/1272937
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605244}
[modify] https://crrev.com/183dcec54bb0e630814f54638a0d862da7315029/third_party/blink/renderer/bindings/core/v8/js_based_event_listener.cc
[modify] https://crrev.com/183dcec54bb0e630814f54638a0d862da7315029/third_party/blink/renderer/modules/accessibility/ax_object.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2ed9605b4c99774d8865dbd190e13c9fe5c2d03a

commit 2ed9605b4c99774d8865dbd190e13c9fe5c2d03a
Author: Hayato Ito <hayato@chromium.org>
Date: Fri Nov 09 17:31:43 2018

Fix a bug in https://crrev.com/c/1272937, where event.target can be still null

Fix a bug in the previous CL, https://crrev.com/c/1272937, where event.target
can be null when GetElement() returns nullptr.

Bug:  892970 ,  893449 ,  902287 
Change-Id: I7a08227d39117c2dc90fe720f0d6ffd62d9b2ea6
Reviewed-on: https://chromium-review.googlesource.com/c/1322177
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606884}
[modify] https://crrev.com/2ed9605b4c99774d8865dbd190e13c9fe5c2d03a/third_party/blink/renderer/modules/accessibility/ax_object.cc