Also add simple unittests for the wrapper. Bug: webrtc:11404 Change-Id: I41d185da9bce392297d1982194c059bddb7881ac Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/171481 Reviewed-by: Philip Eliasson <philipel@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30867}