Apply LightActionBar theme to Settings app.

Bug: 33558692
Test: visual
Test: RunSettingsRoboTests
Change-Id: I9f0fb71eb0cd0c58ac3b0f69544adec963faf2dd

res/drawable/ic_search_24dp.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2016 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.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0"
+        android:tint="?android:attr/colorControlNormal">
+    <path
+        android:pathData="M15.5,14l-0.8,0l-0.3,-0.3c1,-1.1 1.6,-2.6 1.6,-4.2C16,5.9 13.1,3 9.5,3C5.9,3 3,5.9 3,9.5S5.9,16 9.5,16c1.6,0 3.1,-0.6 4.2,-1.6l0.3,0.3l0,0.8l5,5l1.5,-1.5L15.5,14zM9.5,14C7,14 5,12 5,9.5S7,5 9.5,5C12,5 14,7 14,9.5S12,14 9.5,14z"
+        android:fillColor="#ffffff"/>
+</vector>