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This is a reland of db6fcd22.

Original change's description:
> Creates a virtual device when CCA opens a camera.
>
> Bug: b:151047537
> Test: Manually test
> Change-Id: I3a2196e32e18ecfb127553f47178f8ebe43656c0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2351933
> Reviewed-by: Ken Buchanan <kenrb@chromium.org>
> Reviewed-by: Wei Lee <wtlee@chromium.org>
> Commit-Queue: Heng-ruey Hsu <henryhsu@chromium.org>
> Auto-Submit: Heng-ruey Hsu <henryhsu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#837425}

TBR=wtlee@chromium.org,rsesek@chromium.org

Bug: b:151047537
Test: Manually test.
Change-Id: I3d06b0aecd972024b89582ce4847075da3b55b20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612314Reviewed-by: Heng-ruey Hsu <henryhsu@chromium.org>
Commit-Queue: Heng-ruey Hsu <henryhsu@chromium.org>
Auto-Submit: Heng-ruey Hsu <henryhsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842469}