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This is the receiver side of Cast audio capture service that will
observing platform audio input hoocked in assistant service. More info
can be found in the design go/comms-virtual-mic.

tests on desktop.

Bug: internal: 133880006
Merge-With: eureka-internal/274195
Test: Make OTT call on Home after patching all CLs. Run and pass unit
Change-Id: I662c77f4fae819ced791861ca5b762cdf08e8f82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1655085
Commit-Queue: Kehuang Li <kehuangli@chromium.org>
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675845}