This patch exposes webrtc::PeerConnectionDependencies c++-object and makes it possible to supply one when creating a PeerConnection. This makes it possible to e.g inject a VideoBitrateAllocatorFactory. Bug: webrtc:10547 Change-Id: Ib7431bdcec1380e7903dc5f66f3583501aeab0a5 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168307 Commit-Queue: Jonas Oreland <jonaso@webrtc.org> Reviewed-by: Anders Carlsson <andersc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30480}