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This will allow for new methods that operate on AXNodeIds, like
Accessibility.click and Accessibility.focus. It also allows multiple
calls to getFullAXTree to be compared.

Bug: 887173
Change-Id: Iaaf103bced9c5dbc9dd04306c2562044f50dfd2c
Reviewed-on: https://chromium-review.googlesource.com/c/1237526
Commit-Queue: Joel Einbinder <einbinder@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599847}