Always having the latest iosurface before invalidating a region.
Otherwise if CaptureFrame() happens in between, the capture result
may not be fully refreshed. Also we can't add lock since it will
impact performance.
Bug: webrtc:8652
Change-Id: Ib23105b16065018c691685083b76a771ce8771d3
Reviewed-on: https://webrtc-review.googlesource.com/74643
Reviewed-by: Zijie He <zijiehe@chromium.org>
Commit-Queue: Brave Yao <braveyao@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23154}
1f184f0a15