Add support for external encoders in ACM
Also introduce tests using external (mock) encoders, both for
CodecOwner and for AudioCodingModule.
Support for external decoders is still missing.
COAUTHOR=henrik.lundin@webrtc.org
BUG=4474
R=jmarusic@webrtc.org, minyue@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/49939004
Cr-Original-Commit-Position: refs/heads/master@{#9206}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 7e0c7d49ea45e3e6743ca9cfafba337c04eae657
12 files changed
