It make sense to initialize dictionary with capacity to avoid reallocation during inserting values to dictionary. Bug: None Change-Id: Ic3e73b95a36a39dafb89e57d49e89424eb131b4c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/375960 Reviewed-by: Kári Helgason <kthelgason@webrtc.org> Commit-Queue: Yury Yarashevich <yura.yaroshevich@gmail.com> Cr-Commit-Position: refs/heads/main@{#43836}