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This CL lies out the directory layout for CAF migration. The
migrated code will reside in caf/, in parallel of cast/. The
migrated code is guarded behind a feature flag.

Bug: 711860
Change-Id: Iddfe9e3ce3103fae876c9c151c96aba2ef99354f
Reviewed-on: https://chromium-review.googlesource.com/977232Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Zhiqiang Zhang <zqzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546175}