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Check whether there is a keyboard mic. If yes, adding keyboard mic
effect on lacros-chrome.

BUG=b:173113548

Change-Id: I5241c11031cd5f681380f091dac23fbc82b3d75f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536661
Commit-Queue: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828176}