Add missing includes and dependency. Forward declaring VideoDecoderFactory started causing compilation errors when user doesn't explicitly specify one. Bug: None Change-Id: Id7d1634d5dc409a1c3f9e4778deee21f345e7cdf Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/139250 Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28124}