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This adds infobars on Desktop and Android for showing the known
monitoring disclosure.

The infobar is shown once every 7 days. The last dismissal time is
tracked in a pref on Android (to carry over across sessions) and
in-memory on Desktop (since sessions are longer -- this means on
Desktop we will always show on startup).

These currently link to chrome://monitoring (implemented in
crrev.com/c/1913715), and are triggered on visiting
https://badssl.com/test/monitoring-disclosure/ (to be replaced by
checking for the new monitoring CertStatus based on CRLSets).

Screenshots
- Desktop: https://drive.google.com/file/d/1AF2uCGfYfrQHJbLGjIX132xR0n8GqG5R/view
- Android: https://drive.google.com/file/d/1FeDSEQNasHfPdc6bbkprm_wOaMZcCDQl/view

Bug: 1014711
Change-Id: I31e9d5be6da7d87dfda2f5c739f1b94df1c8a0f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918188Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Commit-Queue: Christopher Thompson <cthomp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719276}