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The Autofill.SuggestionAcceptIndex metric encompasses credit card and
address forms. Note that "address forms" is generally used to refer to
forms that use data from AutofillProfiles--including forms without
addresses, e.g. a sign-up form with name, phone, and email fields.

The present logging does not allow us to answer form-specific questions
such as "What percentage of users select one of the first three
suggestions for credit card forms?" "For address forms?"

Given our findings about the differences between the number of credit
cards and the number of profiles that users have, which influences the
number of suggestions we show in each context, and hence, the suggestion
accepted index, it would be more useful to split this metric by form
type:

(1) CreditCard
(2) Profile
(3) Other

Please refer to the findings in the table on page 3 (Googlers only):
https://docs.google.com/document/d/1qU7jJ6DmNgC1WLG9HrxGdgDoPWmQSAi9mAldIy9X8rU/edit

Bug: 964422
Change-Id: I422af5fd995b4032ec3bc931697e43a8eac1cab9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1617092
Auto-Submit: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Nik Bhagat <nikunjb@chromium.org>
Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#665992}