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ax_dump_tree tool: add --pid command line argument on Mac/Linux to dump accessible tree by process id

Bug: None
Change-Id: Ie374dfb692757f1106d81cfbde652ac31e8c9db9
AX-Relnotes: n/a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410121
Commit-Queue: Alexander Surkov <asurkov@igalia.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807569}