Move Viewport types to DisplayViewport

DisplayViewport.java should be as close to DisplayViewport.cpp as
possible, but currently, the constants are defined in
InputManagerService. Move them to DisplayViewport in preparation for
storing the type alongside the viewport.

Test: build only
Bug: 111108021
Change-Id: I5cc5e37723486310c8f211ecef975ff822812603
2 files changed