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--active-tab is a handy way to dump accessible tree of an active tab in
a browser and allows to reduce bulky output from the browser UI.
The selector is intended to be used in conjunction with other selectors,
for example, ax_dump_tree --firefox --active-tab will dump
accessible tree of a selected tab in Firefox browser.

Bug: 1124366
Change-Id: I5ddfa333d44d0e854e5b38d98f52e226a9a53e06
AX-Relnotes: n/a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416773Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Alexander Surkov <asurkov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#809333}