Add a histogram WebRTC.Audio.Agc.InputClippingRate and logging of max clipping rate in AgcManagerDirect. Bug: webrtc:12774 Change-Id: I4a72119b65ad032fc50672e2a8fb4a4d55e1ff24 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/225264 Commit-Queue: Hanna Silen <silen@webrtc.org> Reviewed-by: Minyue Li <minyue@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34450}