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If a user focuses a field for which password generation is promoted, a popup is
shown.

http://crrev.com/288935 introduced that this popup remains visible until the
user has typed 5 characters, hypothesizing that users look at their keyboard
while typing and therefore not notice the popup.

Our new hypothesis is that this a) may not be true, and b) may bother users
because the popup occludes part of the website, in particular it can occlude
password requirements for users who chose to invent their own password.

This CL introduces a Finch experiement such that we can test whether keeping the
popup visible until the user has typed >5 characters produces a statistically
significant higher number of generated passwords. If not, we can just hide the
password generation popup as soon as the user has typed a key.

The default configuration sticks to the 5 character threshold.

Bug: 859472
Change-Id: I1d2a82ce90f696dc32d97633ac29ba15f3ea9bbd
Reviewed-on: https://chromium-review.googlesource.com/1122399
Commit-Queue: Dominic Battré <battre@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572131}