This aligns rounding in videoprocessor with rounding in encoder wrappers. Bug: none Change-Id: I8bdab7c02628b433d35d63c4bf4c841ffb1c2d1b Reviewed-on: https://webrtc-review.googlesource.com/69983 Commit-Queue: Sergey Silkin <ssilkin@webrtc.org> Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22880}