Add separate functions for returning stats from send/receive stream and updated how functions are used. Add test implementation for histogram methods in system_wrappers/interface/metrics.h. BUG=4519 R=pbos@webrtc.org, stefan@webrtc.org Review URL: https://webrtc-codereview.appspot.com/49639004 Cr-Commit-Position: refs/heads/master@{#9009}
Description
The idea is to make CMake build for WebRTC m130 version - for audio processing module
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