This CL creates a new stream interface and uses it to replace most of the usage of AudioFrame in the non-test code. The CL changes some of the test code as well, as the other changes required that. The CL will be followed by 2 more related CLs. Bug: webrtc:5298 Change-Id: I5cfbe6079f30fc3fbf35b35fd077b6fb49c7def0 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/170040 Commit-Queue: Per Åhgren <peah@webrtc.org> Reviewed-by: Sam Zackrisson <saza@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30799}