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This CL adds skeleton for implementation of the media backend library.
Will integrate it with the system in a separate CL.

Bug: 772488
Change-Id: I9b8c7226eca2d34bbd607be2ad793dfe39a1eaac
Reviewed-on: https://chromium-review.googlesource.com/710510
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#507857}