Add icon for anomaly preference

Bug: 36924669
Test: Screenshot
Change-Id: Ie0925504a36ec3778e793c1f2d9bc00f1163cf34

res/drawable/ic_battery_alert_24dp.xml

@@ -0,0 +1,25 @@
+<!--
+  ~ Copyright (C) 2017 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/colorError">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M15.67,4L14,4L14,2h-4v2L8.33,4C7.6,4 7,4.6 7,5.33v15.33C7,21.4 7.6,22 8.33,22h7.33c0.74,0 1.34,-0.6 1.34,-1.33L17,5.33C17,4.6 16.4,4 15.67,4zM13,18h-2v-2h2v2zM13,14h-2L11,9h2v5z"/>
+</vector>

res/xml/power_usage_summary.xml

@@ -27,6 +27,7 @@
 
     <Preference
         android:key="high_usage"
+        android:icon="@drawable/ic_battery_alert_24dp"
         android:title="@string/power_high_usage_title"/>
 
     <PreferenceCategory