Add tests for KeyEventDispatcher.

Some minor but needed changes to the class under test to
gain visibility for tests to do things like make events
on Handlers happen on demand to verify various event ordering.

Change-Id: I5096de697906f8d28b47f47dc2be2f8199ee4e19
diff --git a/services/tests/servicestests/Android.mk b/services/tests/servicestests/Android.mk
index 50e0662..fb8d814 100644
--- a/services/tests/servicestests/Android.mk
+++ b/services/tests/servicestests/Android.mk
@@ -13,6 +13,7 @@
 
 LOCAL_STATIC_JAVA_LIBRARIES := \
     frameworks-base-testutils \
+    services.accessibility \
     services.core \
     services.devicepolicy \
     services.net \