Add a GN target for unit tests, get them working again and added a test.

BUG=webrtc:3417

Review-Url: https://codereview.webrtc.org/2050153003
Cr-Commit-Position: refs/heads/master@{#14959}
diff --git a/AUTHORS b/AUTHORS
index 729f804..89606de 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -1,6 +1,7 @@
 # Names should be added to this file like so:
 # Name or Organization <email address>
 
+Adam Fedor <adam.fedor@gmail.com>
 Alexander Brauckmann <a.brauckmann@gmail.com>
 Andrew MacDonald <andrew@webrtc.org>
 Anil Kumar <an1kumar@gmail.com>