Add ComponentFilter information to chrome://sandbox

Extracts requested component filters from MitigationFlags and passes
the expanded ComponentFlags through to chrome://sandbox, then displays
them in a table.

Bug: 1174199
Change-Id: Idc73755febd905791cd0c016771e3ec2a83f0ac6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3387750


Reviewed-by: James Forshaw <forshaw@chromium.org>
Commit-Queue: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#959301}