Revert "Remove SystemProperty gating-flag for virtual displays."

Test team is still relying on this.  We'll keep this until the virtual display input code goes in this week.

This reverts commit abcc8e54f636bd4eaff5f85d54d5ff8b75508bb9.

Change-Id: Ic591f813289191b09367a76be3221183562256a7
1 file changed