Add early warning tip and detector

When battery cannot make to usual charging time, this tip would
suggest user to turn on battery saver.

This tip has two visible state(NEW, HANDLED) and display different
information.

This cl also adds an action to turn on the battery saver.

Bug: 70570352
Test: RunSettingsRoboTests
Change-Id: I0e96554df12a0d6508c27174e16d8dca7f4e1fce

res/drawable/ic_perm_device_information_green_24dp.xml

@@ -0,0 +1,26 @@
+<!--
+    Copyright (C) 2018 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="#0F9D58"
+        android:pathData="M13,7h-2v2h2L13,7zM13,11h-2v6h2v-6zM17,1.01L7,1c-1.1,0 -2,0.9 -2,2v18c0,
+        1.1 0.9,2 2,2h10c1.1,0 2,-0.9 2,-2L19,3c0,-1.1 -0.9,-1.99 -2,-1.99zM17,19L7,19L7,5h10v14z"/>
+</vector>