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Autocomplete attributes are string properties of DOM elements. For
parsing password forms, a few special values are important.

This CL adds a few functions to password_form_conversion_utils to
compute an enum representation of the autocomplete attributes, and a
simple cache to keep those computed values to minimize string
comparisons.

Bug: 833838
Change-Id: I6c386895be9af54ae1e31c715795a26b29eb0e5c
Reviewed-on: https://chromium-review.googlesource.com/1027881Reviewed-by: Roger McFarlane <rogerm@chromium.org>
Commit-Queue: Vaclav Brozek <vabr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561441}