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This change implements a class that maps between AXNode IDs to unique
Fuchsia Node IDs.

Bug: fuchsia:63607
Test: AXTreeConverterTest.*
Change-Id: I75352da5b310112d07bd353ea4af7e23c52eac06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2530981Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Sharon Yang <yangsharon@chromium.org>
Commit-Queue: Lucas Radaelli <lucasradaelli@google.com>
Cr-Commit-Position: refs/heads/master@{#828450}