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This CL adds the functionality to have an aec group ID, which allow
Chromium to take actions that is specific for the echo canceller
parameter set that is being used in the Chrome Audio Server.

BUG=chromium:907917
CQ-DEPEND=CL:1349280,CL:1349353

Change-Id: I391fd0a65858a2635c8927dc2a8816dfb9cd4221
Reviewed-on: https://chromium-review.googlesource.com/c/1349260Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Max Morin <maxmorin@chromium.org>
Commit-Queue: Per Åhgren <peah@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612852}