We are starting to move code to setup our tests from [1]. We are moving only scripts to download and build apprtc, collider and node (scripts that work on firefox have not been copied by this CL). [1] - https://chromium.googlesource.com/chromium/deps/webrtc/webrtc.DEPS/ BUG=webrtc:7602 NOTRY=True Review-Url: https://codereview.webrtc.org/2861653005 Cr-Commit-Position: refs/heads/master@{#18060}