[mediacapture-main] Echo Cancellation (#597)

jgupta has just created a new issue for https://github.com/w3c/mediacapture-main:

== Echo Cancellation ==
On #577 echo cancellation definition was changed to make the scope more explicit. However, I am confused by [several comments](https://bugs.chromium.org/p/chromium/issues/detail?id=687574#c38) made [by the Chrome team](https://bugs.chromium.org/p/chromium/issues/detail?id=687574#c40).

What is the use of echoCancellation property in spec if it does not make it clear that echo cancellation must attempt to remove all sounds from the input. Does [echo cancellation definition](https://w3c.github.io/mediacapture-main/#def-constraint-echoCancellation) not considered part of spec or is it that definition itself is not clear?

Please view or discuss this issue at https://github.com/w3c/mediacapture-main/issues/597 using your GitHub account