This CL increases the maximum supported sample rate so that all rates up to 384000 Hz are handled. The CL also adds tests that verifies that APM works as intended for different combinations of number of channels and sample rates. Bug: webrtc:10882 Change-Id: I98738e33ac21413ae00fec10bb43b8796ae2078c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/150532 Commit-Queue: Per Åhgren <peah@webrtc.org> Reviewed-by: Sam Zackrisson <saza@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29014}