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The WPT tests check the Accept-CH-Lifetime (ACL) header functionality.

Add tests for:
(i) When ACL header is sent by a same-origin iframe.
(ii) When ACL header is sent by a cross-origin iframe.
(iii) When ACL header is sent by a subresource.
(iv) When ACL header is sent on the main frame.

Also, change the ACL persistence time-duration from 20
seconds to 5 seconds to make it easier to run multiple tests
quickly and without waiting too long.

Change-Id: I31047598bbb1e7c64cadf3e6845bf850c29aca8b
Bug: 856700
Reviewed-on: https://chromium-review.googlesource.com/1119848
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Yoav Weiss <yoav@yoav.ws>
Cr-Commit-Position: refs/heads/master@{#572273}