Adding hidden APIs for observing the print jobs state.

This is needed for implementing the print job settigns UI.

bug:10935736

Change-Id: I63b42cbf4ce6a259fa1af47fa368b148ca5621c1
diff --git a/Android.mk b/Android.mk
index 14d1a02..13b717a 100644
--- a/Android.mk
+++ b/Android.mk
@@ -166,6 +166,7 @@
 	core/java/android/print/IPrinterDiscoveryObserver.aidl \
 	core/java/android/print/IPrintDocumentAdapter.aidl \
 	core/java/android/print/IPrintClient.aidl \
+	core/java/android/print/IPrintJobStateChangeListener.aidl \
 	core/java/android/print/IPrintManager.aidl \
 	core/java/android/print/IPrintSpooler.aidl \
 	core/java/android/print/IPrintSpoolerCallbacks.aidl \