Settings: Fabulous "Add rule" button.

Bug: 20064962
Change-Id: If7ff9d6cdfc61e5dd9e0d3bc4e2228c5fdaf9fa9

res/drawable/fab_background.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2015 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.
+-->
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+        android:color="@color/fab_ripple">
+    <item>
+        <shape>
+            <solid android:color="@color/fab_shape" />
+        </shape>
+    </item>
+</ripple>