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This CL adds PATL blocking page strings and blocking page.

Bug: 1015661
Change-Id: I9641c94c0989b1d6335eff6b1ef4cb59bc002f37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895784
Commit-Queue: Yilkal Abe <yilkal@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715329}