It's downloaded as a file in src/ and is listed in webrtc-adapter.
It should be used to ensure crossbrowser compatibility, since the WebRTC specs are forever evolving.
adapter.js is a shim to insulate apps from spec changes and prefix differences in WebRTC. The prefix differences are mostly gone these days but differences in behaviour between browsers remain.
It's downloaded as a file in
src/
and is listed in webrtc-adapter. It should be used to ensure crossbrowser compatibility, since the WebRTC specs are forever evolving.