a1a040a4a4
This CL contains all the changes made to audio_coding while making audio encoders injectable. Apart from some small changes to webrtcvoiceengine, nothing here is hooked up to the outside world. Those changes will be added to a follow-up CL. BUG=webrtc:5806 Review-Url: https://codereview.webrtc.org/2695243005 Cr-Commit-Position: refs/heads/master@{#17569}