Daniel Collins d093d0db7f Change CallbackDeferrer to pre-reserve the deferred vector.
The push_back pattern results in frequent vector growth which has performance overhead. This is .5% of our server's CPU

Bug: webrtc:15723
Change-Id: Ic151c81a4b49a7d48a354b75f62694bc6f9a1ee4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/331440
Reviewed-by: Victor Boivie <boivie@webrtc.org>
Commit-Queue: Daniel Collins <dpcollins@google.com>
Cr-Commit-Position: refs/heads/main@{#41388}
2023-12-14 21:08:58 +00:00
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