Fix layoutlib to reflect recent changes in platform code

Test: Layoutlib tests
Change-Id: I81964233a9e580ccee9c9e9b0cf3525babf30bd4
diff --git a/bridge/src/android/os/SystemProperties_Delegate.java b/bridge/src/android/os/SystemProperties_Delegate.java
index af0c456..d299add 100644
--- a/bridge/src/android/os/SystemProperties_Delegate.java
+++ b/bridge/src/android/os/SystemProperties_Delegate.java
@@ -102,4 +102,9 @@
     /*package*/ static void native_add_change_callback() {
         // pass.
     }
+
+    @LayoutlibDelegate
+    /*package*/ static void native_report_sysprop_change() {
+        // pass.
+    }
 }