GitLab

Populate NetworkIsolationKey in MockHttpRequest so that the tests are
equipped to support partitioned Http cache. Also passes the
generated cache key in various test utility functions instead of simply
the URL.

Bug: 1009621
Change-Id: I5c9577a8bffc9438902bd9c079a703a2dcf6e191
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1830094
Commit-Queue: Shivani Sharma <shivanisha@chromium.org>
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708697}