Uses FIFO with interval 1 and mailbox/immediate with interval 0 (with a
fallback to FIFO).  An end2end test is added to make sure the present
mode is correctly set.

Bug: angleproject:2932
Change-Id: I45d2b1e551b5c63c42ca3c8964bd5e62abd2d459
Reviewed-on: https://chromium-review.googlesource.com/c/1456622Reviewed-by: Ian Elliott <ianelliott@google.com>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>