[Offline pages] Setting a proper NTP incognito message for offline pages

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 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. -->
 
 <org.chromium.chrome.browser.ntp.IncognitoNewTabPageView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:chrome="http://schemas.android.com/apk/res-auto"
     android:id="@+id/ntp_content"
     android:layout_width="match_parent"
@@ skipping 32 matching lines @@
 
             <TextView
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:fontFamily="sans-serif-light"
                 android:text="@string/new_tab_incognito_header"
                 android:textColor="#d2d2d2"
                 android:textSize="24sp" />
 
             <TextView
+                android:id="@+id/new_tab_incognito_message"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_marginTop="32dp"
                 android:layout_marginBottom="10dp"
                 android:maxWidth="660dp"
                 android:singleLine="false"
                 android:text="@string/new_tab_incognito_message"
                 android:textColor="#bdbdbd"
                 android:textSize="14sp"
                 android:lineSpacingMultiplier="1.2" />
@@ skipping 10 matching lines @@
                 android:text="@string/learn_more"
                 android:textAllCaps="true"
                 android:textColor="#03a9f4"
                 android:textSize="14sp" />
 
         </LinearLayout>
 
     </org.chromium.chrome.browser.ntp.NewTabScrollView>
 
 </org.chromium.chrome.browser.ntp.IncognitoNewTabPageView>