Manage data plans settings preference.

Change-Id: I4e15921e793c8c336325e14bec8638d5f71dae17
Note: These changes are required for Data balance UI.
Bug: 62349208
Test: make RunSettingsRoboTests -j40

res/layout/manage_data_plans_preference.xml

@@ -0,0 +1,32 @@
+<?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.
+-->
+
+<FrameLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:paddingStart="@dimen/preference_no_icon_padding_start"
+        android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
+        android:paddingTop="8dp"
+        android:paddingBottom="16dp">
+    <Button
+            android:id="@+id/manage_data_plans"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/data_plan_usage_manage_plans_button_text"
+            android:textAllCaps="true"
+            style="@style/AppActionPrimaryButton" />
+</FrameLayout>