Initial API for providing suggestions.

This is a WIP system api that will be
 - Implemented by one unbundled app (SettingsIntelligence) using system-sdk,
 - and consumed by Settings app.

Note: The bundled app does not have permission to read/write any
      user settings. Nor does it have permission to call any private API
      to do anything unsafe.

Test: builds
Test: instrumentation test
Bug: 65065268
Change-Id: Ib190c0e4c167deb3c6197b8a5b39d442d804770b
diff --git a/Android.mk b/Android.mk
index 76ca9b9..09e596f 100644
--- a/Android.mk
+++ b/Android.mk
@@ -305,6 +305,7 @@
 	core/java/android/service/notification/IStatusBarNotificationHolder.aidl \
 	core/java/android/service/notification/IConditionListener.aidl \
 	core/java/android/service/notification/IConditionProvider.aidl \
+	core/java/android/service/settings/suggestions/ISuggestionService.aidl \
 	core/java/android/service/vr/IPersistentVrStateCallbacks.aidl \
 	core/java/android/service/vr/IVrListener.aidl \
 	core/java/android/service/vr/IVrManager.aidl \