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The type action allows for text to be typed into a field, enabling
more autofill scenarios, and additionally enabling for password
manager automation, which I am working on extending autofill
automation to support.

There are a great deal many more flows needed for
password automation compared to autofill (i.e. save password on login,
don't save password on login, update password on change, etc), and
"save password" is just the first of them - but this change lays
important groundwork by adding AX IDs to the confirm infobar so that
automation can tap them.

Change-Id: I5368fabfbc1a450341969b63936960dce2de6246
Reviewed-on: https://chromium-review.googlesource.com/c/1332008
Commit-Queue: ericale <ericale@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607415}