Support help message when battery is unavailable(1/2)

- Present help preference when battery is unavailable

Bug: 179237551
Test: make SettingsRoboTests
Change-Id: If6e82210d831123cb1169d53a18d24cb2c576b10

res/layout/preference_battery_error.xml

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2021 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.
+  -->
+<!-- TODO(b/179237551): Refine the layout once the design been lock down. -->
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+    <com.google.android.material.card.MaterialCardView
+        android:id="@+id/container"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
+        android:layout_marginEnd="24dp"
+        style="@style/ContextualCardStyle">
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="top|start"
+            android:orientation="vertical"
+            android:padding="16dp"
+            android:background="@color/homepage_emergency_background">
+
+            <ImageView
+                android:id="@+id/battery_icon"
+                android:src="@drawable/ic_battery_alert_24dp"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content" />
+
+            <TextView android:id="@+id/summary_text"
+                      android:layout_width="match_parent"
+                      android:layout_height="wrap_content"
+                      android:text="@string/battery_missing_message"
+                      android:textAppearance="?android:attr/textAppearanceSmall"
+                      android:textColor="?android:attr/textColorSecondary" />
+
+            <TextView android:id="@+id/link_text"
+                      android:layout_width="wrap_content"
+                      android:layout_height="wrap_content"
+                      android:layout_gravity="end"
+                      android:text="@string/battery_missing_link_message"
+                      android:textAppearance="?android:attr/textAppearanceSmall"
+                      android:textColor="?android:attr/colorError" />
+        </LinearLayout>
+    </com.google.android.material.card.MaterialCardView>
+</FrameLayout>