This improves execution speed by skipping the encoding step. Bug: webrtc:10365 Change-Id: I6aef1376c157d859f05f4a44f881d1c60f353067 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/167082 Commit-Queue: Sebastian Jansson <srte@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30385}