autotest: cellular: Added network_ChromeCellularSmokeTest

Wrote a new telemetry/autotest test that is basically
network_3GSmokeTest but for the UI. The test uses pseudomodem and
chrome.networkingPrivate.

BUG=chromium:262349
CQ-DEPEND=I912a3d3dd0e6079746d3b12fe0cdad61c4f28f8e
TEST=network_ChromeCellularSmokeTest

Change-Id: I9553bd61edb8ac708f330b74f85eb88c5e2be11f
Reviewed-on: https://gerrit.chromium.org/gerrit/63103
Reviewed-by: Prathmesh Prabhu <pprabhu@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Arman Uguray <armansito@chromium.org>
Tested-by: Arman Uguray <armansito@chromium.org>
5 files changed