Add callback hack to find out when to load system properties.

Use this to reload the trace and layout bounds properties.

This is ONLY for debugging.

Change-Id: I1c4bdb52c823520c352c5bac45fa9ee31160793c
diff --git a/core/java/android/view/View.java b/core/java/android/view/View.java
index 9fa67ac..aad6756 100644
--- a/core/java/android/view/View.java
+++ b/core/java/android/view/View.java
@@ -17250,7 +17250,7 @@
         /**
          * Show where the margins, bounds and layout bounds are for each view.
          */
-        final boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false);
+        boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false);
 
         /**
          * Point used to compute visible regions.