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Also extract common full-codebase coverage properties to a mixin.

Bug: 1010702
Change-Id: If60cc49c9040702e4f8138d46af74bbd89e204d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834951
Commit-Queue: Sajjad Mirza <sajjadm@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704919}