Investigate virtual time for deterministically replaying the network stack

[matthewmueller]

resources:

• https://groups.google.com/a/chromium.org/forum/?utm_medium=email&utm_source=footer#!topic/headless-dev/v8GtCwr4X_o
• https://docs.google.com/document/d/1y9KDT_ZEzT7pBeY6uzVt1dgKlwc1OB_vY4NZO1zBQmo/edit