Add the crosvm user to the cras group

Crostini virtual machines will now be able to play audio, but to do so,
the crosvm user they run as needs access to the cras server.

BUG=781398
TEST=play audio from a vm on octopus
CQ-DEPEND=CL:1440761

Change-Id: Ib4cb20a482d80e575e06465ee153a442bc528569
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1440722
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/profiles/base/accounts/group/cras b/profiles/base/accounts/group/cras
index eb8c051..8d31f72 100644
--- a/profiles/base/accounts/group/cras
+++ b/profiles/base/accounts/group/cras
@@ -1,7 +1,8 @@
 group:cras
 gid:600
 # The browser runs as chronos.
+# VMs run as the crosvm user.
 # The power manager needs to check if audio is playing.
 # The rtanalytics process (running as the rtanalytics user) needs to talk to
 #   cras for audio capture.
-users:chronos,power,rtanalytics
+users:chronos,crosvm,power,rtanalytics