a64b75b8f8
This helps prevent non-tool services from enabling other
accessibility services.
Fix: 282987827
Test: Use a non-tool accessibility service to print the nodes on the
screen, observe dialog nodes are missing. Change to a
tool-service and repeat; observe nodes are present.
Test: Confirm that TalkBack can still use this dialog to enable other
services.
Change-Id: I75c4101c6554cc503ed45fc24b8eb36d07250226