Add landscape specs for Data Reduction Proxy promo

chrome/android/java/res/values/dimens.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 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. -->
 
 <resources>
     <!-- Connection info popup dimensions -->
     <dimen name="connection_info_padding_wide">24dp</dimen>
     <dimen name="connection_info_padding_thin">16dp</dimen>
 
@@ skipping 75 matching lines @@
     <dimen name="pref_autofill_field_horizontal_padding">3dp</dimen>
     <dimen name="pref_autofill_field_top_padding">10dp</dimen>
 
     <!-- Minimum height/width for a touchable item -->
     <dimen name="min_touch_target_size">48dp</dimen>
 
     <!-- Data Saver -->
     <dimen name="data_usage_chart_height">252dp</dimen>
     <dimen name="data_reduction_promo_screen_width">330dp</dimen>
     <dimen name="data_reduction_promo_screen_height">460dp</dimen>
+    <dimen name="data_reduction_promo_screen_width_horizontal">480dp</dimen>
+    <dimen name="data_reduction_promo_screen_height_horizontal">310dp</dimen>
     <dimen name="data_reduction_promo_title_text_size">20sp</dimen>
     <dimen name="data_reduction_promo_normal_text_size">14sp</dimen>
     <dimen name="data_reduction_promo_button_text_size">13sp</dimen>
     <dimen name="data_reduction_promo_illustration_margin_bottom">30dp</dimen>
 
     <!-- Text bubble dimensions -->
     <!-- Tooltip min distance from the edge of the screen. -->
     <dimen name="tooltip_min_edge_margin">3dp</dimen>
     <!-- Tooltip margin above click target. -->
     <dimen name="tooltip_top_margin">2dp</dimen>
@@ skipping 187 matching lines @@
     <dimen name="default_favicon_size">16dp</dimen>
 
     <!-- Media UI dimensions -->
     <!-- The media_session_icon_size is just big enough to make sure Android doesn't discard the
          icon but otherwise, the icon is meant to be a flat color so it doesn't really matter. -->
     <dimen name="media_session_icon_size">48dp</dimen>
 
     <!-- Offline pages dimensions -->
     <dimen name="offline_page_item_vertical_spacing">40dp</dimen>
 </resources>