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This is a reland of c14fae86

Original change's description:
> [fuchsia][a11y] Refactors convert node ID logic.
>
> This change refactors the logic to convert an ax node ID to a fuchsia semantic node ID.
>
> It also fixes the bug where if a regular ax node had ID == 0, it would conflict with the root ID.
>
> R=yangsharon
>
> TEST: web_engine_unittests
> Change-Id: Ie4ee52c65fbd5ad623986e015ad521e66c5e67fe
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2430264
> Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
> Reviewed-by: Sharon Yang <yangsharon@chromium.org>
> Commit-Queue: Lucas Radaelli <lucasradaelli@google.com>
> Cr-Commit-Position: refs/heads/master@{#811926}

Change-Id: I8b89cb69007c7e7557660ef70e71d28807fff436
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441278
Auto-Submit: Lucas Radaelli <lucasradaelli@google.com>
Reviewed-by: Sharon Yang <yangsharon@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813820}