[viewcompiler] Enable input from file descriptor

This is needed to be able to launch the viewcompiler from installd. We only
support FD-input mode when reading from APKs. For output to an FD, we rely on
stdout redirection.

Bug: 111895153
Change-Id: I3025d83c60494485bada5f2f4cd67e25354d1d53
3 files changed