The goal is to be able to write the rtc::Buffer by another utility (like rtc::ByteBufferWriter) and pass it into EncodedImageBuffer without memcpy. Bug: webrtc:42223344 Change-Id: Ieda55e77a36636e8cdff6ad6b7d078de0aeafec0 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/364243 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#43179}