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an application by process id

Implement AccessibleTreeFormatter::BuildAccessibilityTreeForWindow on
mac, which captures an accessible tree of a running application
identified by gfx::AcceleratedWidget, which is HWDN on Windows and
PID or Linux/Mac.

Bug: 1124366
Change-Id: I6295d65a7273a66ed37966a5bfaf0858fe0d4451
AX-Relnotes: n/a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391469
Commit-Queue: Alexander Surkov <asurkov@igalia.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805199}