New API demo showing how to make a resource reference.

Change-Id: I450d70432debc9d7f58a7f6597628dacc0225ddd

samples/ApiDemos/res/values-sw600dp/layout.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2011 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<resources>
+    <!-- Define a new configuration for the resources_layout_reference layout,
+         which uses the special tablet layout. -->
+    <item type="layout" name="resources_layout_reference">
+            @layout/resources_layout_reference_tablet</item>
+</resources>