Implementation of new AecDump interface.
[WORK IN PROGRESS, DO NOT SUBMIT]
[TODO WRITE DESCRIPTION, elaborate]
This CL contains the implementation and tests of the AecDump
interface, defined in the parent CL. There will be a further CL that
adds a top-level task queue and activates the new AecDump instead of
the current functionality.
[TODO ADD TESTS without removing existing ones]
BUG=
webrtc:7404