Add A11y SUW hub page. Minor alterations of

Magnification screen to be consistent wtih most
recent desigs.

Change-Id: I191f6f66edb26597db6f4ed41311998b8ce26ca4

res/layout/preference_button.xml

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2015 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.
+-->
+
+<!-- Layout for a ButtonPreference. -->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:paddingBottom="@dimen/accessibility_button_preference_padding_top_bottom"
+    android:paddingTop="@dimen/accessibility_button_preference_padding_top_bottom"
+    android:paddingStart="@dimen/accessibility_layout_margin_start_end"
+    android:paddingEnd="@dimen/accessibility_layout_margin_start_end"
+    android:focusable="true"
+    android:selectable="false"
+    android:persistent="false" >
+
+        <TextView xmlns:android="http://schemas.android.com/apk/res/android"
+            android:id="@+android:id/title"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:textAppearance="?android:attr/textAppearanceLarge"
+            android:selectable="true"
+            android:persistent="false"
+            android:gravity="left|center" />
+
+        <TextView xmlns:android="http://schemas.android.com/apk/res/android"
+            android:id="@+android:id/summary"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:textAppearance="?android:attr/textAppearanceSmall"
+            android:selectable="true"
+            android:persistent="false"
+            android:gravity="left|center" />
+
+</LinearLayout>