A 32-bit number overflows. It's then capped to compute a 16-bit value. This CL introduces a 64-bit variable on which equivalent operations are performed instead. Bug: chromium:864883 Change-Id: I371af869c6586256b900356491f467bed357e11d Reviewed-on: https://webrtc-review.googlesource.com/89584 Reviewed-by: Sam Zackrisson <saza@webrtc.org> Commit-Queue: Alex Loiko <aleloi@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24041}