Context hub API for applications

Adding a System API for applications to access a context hub.

The API is not expected to be exposed to third party Android
applications in the medium term.

Change-Id: Ia2222317c913de6901f3912e4c89b5cfa398be85
diff --git a/Android.mk b/Android.mk
index 53e892f..057de67 100644
--- a/Android.mk
+++ b/Android.mk
@@ -187,6 +187,8 @@
 	core/java/android/hardware/location/IGeofenceHardware.aidl \
 	core/java/android/hardware/location/IGeofenceHardwareCallback.aidl \
 	core/java/android/hardware/location/IGeofenceHardwareMonitorCallback.aidl \
+	core/java/android/hardware/location/IContextHubCallback.aidl \
+	core/java/android/hardware/location/IContextHubService.aidl \
 	core/java/android/hardware/soundtrigger/IRecognitionStatusCallback.aidl \
 	core/java/android/hardware/usb/IUsbManager.aidl \
 	core/java/android/net/ICaptivePortal.aidl \