chore: cherry-pick a1c1ec1ea9 from chromium

[deepak1556]

Subject: Use AXNodeID rather than AXNode* in AXEventGenerator tree events.

We suspect that sometimes AXNodes are destroyed while processing events.
Specifically, we suspect that the extra mac nodes that are created for
table column and row headers when VoiceOver requests them are destroyed
if an ancestor up the chain is modified. In order to safeguard against
the possibility of an AXNode* becoming stale, we will store AXNodeIDs in
the list of tree events. This way, when the tree event is used, we can
first check for the validity of the AXNodeID before using the
corresponding AXNode.

Bug: 1262967
Change-Id: Ifa2b23544fff532b379857a637f417d5f639c7ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3244046
Commit-Queue: Abigail Klein abigailbklein@google.com
Reviewed-by: Aaron Leventhal aleventhal@chromium.org
Reviewed-by: Nektarios Paisios nektar@chromium.org
Cr-Commit-Position: refs/heads/main@{#937698}

Notes: Security: backported fix for chromium:1262967

[release-clerk]

Release Notes Persisted

Security: backported fix for chromium:1262967