Force copy video frame including video buffer in DefaultVideoQualityAnalyzer to ensure that analyzer won't hold any internal WebRTC buffers. Bug: webrtc:10138 Change-Id: Ib195233f8b01c855220be1b9743c4f54fc62a22b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168643 Commit-Queue: Artem Titov <titovartem@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30535}