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This CL just adds virtual interfaces around the existing classes for the
BLE interfaces. No other code changes should be made.

BUG=internal b/77282414
TEST=cast_bluetooth_unittests cast_internal_bluetooth_unittests

Change-Id: I3891eebb61dd187709ec15bbaac32b962e4c2d9e
Reviewed-on: https://chromium-review.googlesource.com/987374
Commit-Queue: Bailey Forrest <bcf@chromium.org>
Reviewed-by: Conley Owens <cco3@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Stephen Lanham <slan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547343}