Add simple end to end test for video capture and encode using textures.

BUG=webrtc:4993

Review URL: https://codereview.webrtc.org/1482333002

Cr-Original-Commit-Position: refs/heads/master@{#10849}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 9f8d39d1b62bf564cbb93d05974d822801c046e2
1 file changed