* Avoids alloc/dealloc for each captured frame. * Reduces time to capture first frame. * Improves performance in terms of max FPS. Bug: chromium:1412584 Change-Id: Ie16519ad788165c9553451ecea5adff12cd15eea Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/293582 Reviewed-by: Alexander Cooper <alcooper@chromium.org> Commit-Queue: Henrik Andreassson <henrika@webrtc.org> Cr-Commit-Position: refs/heads/main@{#39384}