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This change expands the set of AxNodes that the bridge considers
to support default actions for the purpose of advertising that
support to the Fuchsia a11y-manager.  This will let the screen
reader interact with many more nodes.

R=lucasradaelli@google.com, sergeyu@chromium.org, yangsharon@chromium.org

Test: AccessibilityBridgeTest.PerformDefaultAction
Bug: fuchsia:57669
Change-Id: I6b0858179a6b9ff44fc3c927caa9e517f8ad47e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459933
Commit-Queue: Tess Eisenberger <teisenbe@google.com>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Sharon Yang <yangsharon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815397}