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Follow-up for https://chromium-review.googlesource.com/c/chromium/src/+/1043646.
Here we extend the support for raw file descriptors to the virtual device
functionality.

There is an incompatibility in the serialization of shared memory handles
between the Mojo libraries used in Chromium vs. the older ones used in
ChromiumOS. As a workaround, this CL allows clients of the virtual device API of
the video capture service to ask it to use raw file descriptors for sharing
shared memory handles instead.
Note, this is only supported on platforms that use file descriptors for
base::SharedMemoryHandle, i.e. Posix platforms.

Design Doc: https://docs.google.com/document/d/1cmtWA8yua5sqjZC0tswVUZwJeQR-KSZBr3Mj1jUagKk/edit?usp=sharing

Bug: 847598
Change-Id: I8a49e5181a622e14ea050cde27ad91ff7feda30d
Reviewed-on: https://chromium-review.googlesource.com/1053210
Commit-Queue: Christian Fremerey <chfremer@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573868}