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This action performs the actual autofilling of the form, by selecting a specific
element in an autofillable form, then tapping on the autofill suggestion.

The profile data used to autofill is hardcoded in this file for now. uwyiming@
may have plans to move this profile data into the test recipe in the future, but
for now this is sufficient.

Additionally, I move some shared code between the click and autofill actions to
a base class.

I tested this action using a recipe I wrote against Walmart's shop page.

Bug: 881096
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I9629a11da48a3910c1765f455491456005aada75
Reviewed-on: https://chromium-review.googlesource.com/1208141
Commit-Queue: ericale <ericale@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590452}