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Inspect tools provide option to show internal ids of accessible
objects, which is a handy feature for debugging and event recording.
Platform tree formatters rely on internal accessible trees to retrieve
object ids. It should be avoided, because the tree formatters should
operate on external trees to produce same results not depending on how
a tree formatter was initiated (whether by tests or by ax_dump_tree
tool).

WebKit exposes AXIdentifier attribute, which looks like a great match
for this case. However, no comments from Apple so far about what
exactly this attribute is for, so let's move with ChromeIdentifier
attribute for now. Later it can be revisited.

Bug: 1134623
Change-Id: I367158bc8802734d0e9311c9739eb8da13ff0cf8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2602356
Commit-Queue: Alexander Surkov <asurkov@igalia.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839602}