Adds contextual cards for screen attention in Settings Homepage

Bug: 128527964
Test: atest ContextualAdaptiveSleepSliceTest, maually verified.
Change-Id: Ifaea7d8d4391e91cf6cbde38a2506728f55913d8

res/drawable/ic_settings_adaptive_sleep.xml

@@ -0,0 +1,31 @@
+<!--
+  Copyright (C) 2019 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">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M10.67,21H7v-1h3.13c-0.27-0.63-0.46-1.3-0.56-2H7V6h10v3.5c0.69,0,1.36,0.1,2,0.28V3 c0-1.1-0.9-1.99-2-1.99L7,1C5.9,1,5,1.9,5,3v18c0,1.1,0.9,2,2,2h5.52C11.79,22.45,11.16,21.77,10.67,21z M7,3h10v1H7V3z" />
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M17,12.5c2.48,0,4.5,2.02,4.5,4.5s-2.02,4.5-4.5,4.5s-4.5-2.02-4.5-4.5S14.52,12.5,17,12.5 M17,11 c-3.31,0-6,2.69-6,6s2.69,6,6,6c3.31,0,6-2.69,6-6S20.31,11,17,11L17,11z" />
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M17,14v3l-2.12,2.12C15.42,19.66,16.17,20,17,20c1.66,0,3-1.34,3-3S18.66,14,17,14z" />
+</vector>