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This CL adds feature parameters that create allowlists or blocklists for
warnings, blocking and silent blocking. Finally, it updates the
triggering logic to use those parameters.

The triggering code contains default file extensions which are used when the
feature parameter is not set. These are only used when the user
explicitly enables the feature for testing.

To make testing easier, we:
 - SILENT_BLOCK on files ending in the contrived
   ".silently_block_for_testing".
 - BLOCK files that are executables or archive types, or any download
   that's explicitly user-requested (e.g. from a context menu).
 - WARN on everything else except ".dont_warn_for_testing" files.

Bug: 960819
Change-Id: I006d4e0c3f45b64e3cd84b0ef21cc506988bf5cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1984703
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737470}