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* Basic support: a generic SSL interstitial is used for all SSL
  error types

* Interaction: the user can interact with the page (proceed or
  back out). As with WebView, decisions are not saved across
  sessions.

* Minimal impact: much code that we would like to refactor and
  share is instead copied for now to minimize changes outside
  of //weblayer.

This builds on the work of blundell@chromium.org at
https://chromium-review.googlesource.com/c/chromium/src/+/1872091

Testing is facilitated by badssl.com.

Binary-Size: Increase is due to translations and so cannot be avoided.
Change-Id: I68edba70ee8e0ca1078be13d9ab8bc0d96c0321c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885227Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711516}