Use preference theme from SettingsLib

Bug: 36663882
Test: rerun robotests
Change-Id: I9f0f51a9d070191f5bf8f3315fef4d997d6213c3

tests/robotests/res/layout/preference.xml

@@ -0,0 +1,58 @@
+<?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.
+-->
+
+<!-- A test preference layout containing all required widgets -->
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content">
+
+    <ImageView
+        android:id="@android:id/icon"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+    <TextView
+        android:id="@android:id/title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:singleLine="true"
+        android:textAppearance="@android:style/TextAppearance.Material.Subhead"
+        android:textColor="?android:attr/textColorPrimary"
+        android:ellipsize="marquee"
+        android:fadingEdge="horizontal" />
+
+    <TextView
+        android:id="@android:id/summary"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_below="@android:id/title"
+        android:layout_alignStart="@android:id/title"
+        android:visibility="gone"
+        android:textAlignment="viewStart"
+        android:textAppearance="@android:style/TextAppearance.Material.Body1"
+        android:textColor="?android:attr/textColorSecondary"
+        android:maxLines="10" />
+
+    <LinearLayout
+        android:id="@android:id/widget_frame"
+        android:layout_width="wrap_content"
+        android:layout_height="match_parent"
+        android:minWidth="58dip"
+        android:gravity="end|center_vertical"
+        android:orientation="vertical" />
+
+</LinearLayout>