Add icons to choose lock dialog

- Add icons to items in choose lock dialog
- Add title to the dialog
- Update the font size and color to match specs

Test: Manual. Existing tests pass
Bug: 38394440
Change-Id: Ie7ed9944b71fa5ca408ec6898f49cbd36865a1dd

res/layout/choose_lock_dialog_item.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    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.
+-->
+
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@android:id/text1"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:drawablePadding="24dp"
+    android:ellipsize="marquee"
+    android:gravity="center_vertical"
+    android:minHeight="?android:attr/listPreferredItemHeight"
+    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
+    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
+    android:textAppearance="@android:style/TextAppearance.Material.Subhead"
+    android:textColor="?android:attr/textColorAlertDialogListItem" />