Add support for webapk without runtimeHost

chrome/android/webapk/shell_apk/res/layout/choose_host_browser_dialog.xml

Index: chrome/android/webapk/shell_apk/res/layout/choose_host_browser_dialog.xml
diff --git a/chrome/android/webapk/shell_apk/res/layout/choose_host_browser_dialog.xml b/chrome/android/webapk/shell_apk/res/layout/choose_host_browser_dialog.xml
new file mode 100644
index 0000000000000000000000000000000000000000..bb8c584b77431354910eb5a8c386ed8b805d6681
--- /dev/null
+++ b/chrome/android/webapk/shell_apk/res/layout/choose_host_browser_dialog.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2017 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:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/desc"
+        android:textColor="@android:color/black"
+        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Small"
+        android:paddingStart="20dp"
+        android:paddingEnd="20dp"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+   <ListView
+        android:id="@+id/browser_list"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:divider="@null"
+        android:dividerHeight="0dp" />
+
+</LinearLayout>