Tweak accessibility of DSE FRE page to read title.

chrome/android/java/res/layout/default_search_engine_first_run_fragment.xml

 <?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.
 -->
 
 <!-- Layout used to present a set of default search engines to the user. -->
 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:chrome="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:background="@color/signin_body_background"
+    android:contentDescription="@string/search_engine_dialog_title"
     android:orientation="vertical" >
 
     <FrameLayout
         android:layout_width="match_parent"
         android:layout_height="0dp"
         android:layout_weight="1" >
 
         <org.chromium.chrome.browser.firstrun.FirstRunChooserView
             android:layout_width="match_parent"
             android:layout_height="match_parent"
@@ skipping 10 matching lines @@
                 <!-- The layout_width/layout_height is set to 16/9 dynamically in Java -->
                 <TextView
                     android:id="@+id/chooser_title"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:gravity="bottom"
                     android:paddingStart="@dimen/signin_chooser_padding"
                     android:paddingEnd="@dimen/signin_chooser_padding"
                     android:paddingBottom="@dimen/signin_chooser_padding"
                     android:background="@color/signin_head_background"
+                    android:importantForAccessibility="no"
                     android:textColor="@color/default_text_color"
                     android:textSize="@dimen/fre_title_text_size"
                     android:text="@string/search_engine_dialog_title" />
 
                 <View style="@style/Divider" />
 
                 <org.chromium.chrome.browser.widget.RadioButtonLayout
                     android:id="@+id/default_search_engine_dialog_options"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
@@ skipping 24 matching lines @@
         android:paddingStart="@dimen/fre_button_padding"
         android:paddingEnd="@dimen/fre_button_padding"
         android:text="@string/ok"
         android:textAllCaps="true"
         android:textColor="@android:color/white"
         android:textSize="14sp"
         chrome:buttonColor="@color/light_active_color"
         chrome:buttonRaised="false" />
 
 </LinearLayout>