Add a reference table dump call.

This is just an android.os.Debug method that calls into the VM.

Bug 2075355

core/java/android/os/Debug.java

@@ -752,6 +752,16 @@ href="{@docRoot}guide/developing/tools/traceview.html">Traceview: A Graphical Lo
         return VMDebug.cacheRegisterMap(classAndMethodDesc);
     }
 
+    /**
+     * Dumps the contents of VM reference tables (e.g. JNI locals and
+     * globals) to the log file.
+     *
+     * @hide
+     */
+    public static final void dumpReferenceTables() {
+        VMDebug.dumpReferenceTables();
+    }
+
     /**
      * API for gathering and querying instruction counts.
      *