[remoting android] Display IT2Me host state and access-code.

remoting/android/host/res/layout/main.xml

 <?xml version="1.0" encoding="utf-8"?>
 
 <!-- Copyright 2016 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file.
 -->
 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical">
     <android.support.v7.widget.Toolbar
         android:id="@+id/toolbar"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:background="?attr/colorPrimary"
         android:elevation="4dp"/>
-    <Button
+    <LinearLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center"
-        android:text="Share"
-        android:onClick="onShareClicked"/>
+        android:orientation="horizontal">
+        <Button
+            android:id="@+id/share_button"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Share"
+            android:onClick="onShareClicked"/>
+        <Button
+            android:id="@+id/disconnect_button"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Disconnect"
+            android:onClick="onDisconnectClicked"/>
+    </LinearLayout>
+    <TextView
+        android:id="@+id/status_text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"/>
+    <TextView
+        android:id="@+id/access_code"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:textAppearance="@style/TextAppearance.AppCompat.Large"/>
 </LinearLayout>