Add metrics collection for bitstream audio output support.

This will provide insight into the number of devices which we could
pass AC3, DTS, Dolby TrueHD, Dolby Digital Plus, or DTS-HD to.

TEST=shows supported on my local HTPC.

Change-Id: I4ba4639736802b06e88995c23a7ecc6936dfae62
Reviewed-by: Brian White <>
Commit-Queue: Dale Curtis <>
Auto-Submit: Dale Curtis <>
Cr-Commit-Position: refs/heads/master@{#631870}
2 files changed