To make Environment available for creating AudioDecoders to use propagated field trials Bug: webrtc:356878416 Change-Id: Ic2371f038b75402bbd007c948f43c60cc6cca8a9 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/358400 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Jakob Ivarsson <jakobi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42718}