Resource Scheduler: Enable ThrottleDelayable experiment

This experiment throttles low priority requests based on the
count of high priority requests and the current network quality.
The experiment changes the scheduling behavior only when
the current effective connection type is Slow2G or 2G.

The code to adapt the scheduling behavior based on ECT
is still there in the ResourceScheduler in case we need to
revert it or update the params using finch.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I77ba950344e6ff8e05a83ebb0dc5b48cec6ff3c8
Bug: 746640
Reviewed-on: https://chromium-review.googlesource.com/955703
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542742}
3 files changed