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Adds a URL filter for generic Activity third party
applications. This introduces filter logic for http
and websocket requests according to a provided whitelist.

A follow up CL to introduce the whitelist entry in
cast_web_contents that enable the filters.

Bug: 1054535
Test: CQ, verified url request blocking in devtools
Change-Id: I6a6a50bea79b70e7e91e08832bf9807c91faa53a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050038Reviewed-by: Dominic Battré <battre@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Jiaqi Han <jiaqih@google.com>
Cr-Commit-Position: refs/heads/master@{#743314}