Calculate number of freezes per minute for a received video stream and report this metric to UMA. Bug: webrtc:9803 Change-Id: I6d72a2daf58b2f734a576fff469c1fead6cc69b3 Reviewed-on: https://webrtc-review.googlesource.com/c/103180 Commit-Queue: Sergey Silkin <ssilkin@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24944}