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The test uses a fake clock and simulates network and signaling delays in order to get a repeatable measurement of the time to establish a connection (including DTLS). This will help ensure that various optimizations continue to work as expected, and no new delays are introduced. This CL depends on: https://codereview.webrtc.org/2140283002/ R=honghaiz@webrtc.org, pthatcher@webrtc.org, skvlad@webrtc.org Review URL: https://codereview.webrtc.org/2141863003 . Cr-Commit-Position: refs/heads/master@{#14270}