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When the holdback experiment is enabled, the NetInfo
network quality related Web APIs (https://wicg.github.io/netinfo/)
would report network quality corresponding to the experiment
params.

This CL only affects the NetInfo JavaScript APIs. A subsequent CL
will use the framework in this CL to also override the values
of network quality reported in network quality related client hints
headers.

Change-Id: Iab9d4ecfe7c14eb5d3cee26dbf209fd943156333
Bug: 880545
Reviewed-on: https://chromium-review.googlesource.com/1201343
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590212}