IME interferes with print UI tests

The IME covers parts of the print UI and some tests cannot
find UI elements that are not visible. This change adds a
dummy IME to CTS that shows no UI. Print UI tests now run
with this IME as the currently enabled one.

bug:22559786

Change-Id: I4fd26927a5b7f9bbfaa801f89d534fb6bd38829a
7 files changed