Enabled by setting system property ro.config.headless to 1
This will allow the framework to run without starting activities,
system UI and the keyguard.
Framework can still run services, content providers and broadcast receivers.
Change-Id: I507d461f937f9ae4e0cfc1067d66b83e58904d54
Signed-off-by: Mike Lockwood <lockwood@android.com>