This CL adds detection of components in the render signal that are of
strong narrowband nature and therefore may cause problems for the AEC.
This CL also adds functionality in the echo suppressor to suppress
these signals
BUG=webrtc:7967
Review-Url: https://codereview.webrtc.org/2980493002
Cr-Commit-Position: refs/heads/master@{#18968}