[Reading mode] Add helpers for interacting with the active tree. Intended to reduce duplication and hopefully make things smoother for some upcoming potential refactors around AXPosition. Bug: 411198154 Change-Id: Id24d7aab1c9948ecc73aedf35be302a4dbf74291 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6516045 Commit-Queue: Lauren Winston <lwinston@google.com> Reviewed-by: Kristi Saney <kristislee@google.com> Cr-Commit-Position: refs/heads/main@{#1456553}
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