Adding elevation to NTP snippets

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 249 matching lines @@
     <dimen name="most_visited_offline_badge_size">24dp</dimen>
     <dimen name="ntp_logo_height">116dp</dimen>
     <dimen name="ntp_list_item_padding">16dp</dimen>
     <dimen name="ntp_list_item_min_height">48dp</dimen>
     <dimen name="ntp_list_item_text_size">16sp</dimen>
     <dimen name="ntp_shadow_height">9dp</dimen>
     <dimen name="snippets_thumbnail_size">72dp</dimen>
     <dimen name="snippets_padding_and_peeking_card_height">16dp</dimen>
     <dimen name="snippets_vertical_spacing">1dp</dimen>
     <dimen name="snippets_article_header_height">56dp</dimen>
+    <dimen name="snippets_card_elevation">2dp</dimen>
 
     <!-- Interests page -->
     <dimen name="ntp_interest_item_text_size">20sp</dimen>
     <dimen name="ntp_interest_item_min_height">180dp</dimen>
     <dimen name="ntp_interest_item_image_size">120dp</dimen>
     <dimen name="ntp_interest_item_image_text_size">20sp</dimen>
 
     <!-- Recent tabs page -->
     <dimen name="recent_tabs_visible_separator_padding">8dp</dimen>
 
@@ skipping 46 matching lines @@
     <dimen name="payments_section_separator_height">1dp</dimen>
     <dimen name="payments_section_logo_height">36dp</dimen>
     <dimen name="payments_section_logo_width">56dp</dimen>
     <dimen name="payments_ui_max_dialog_width">0dp</dimen>
     <dimen name="payments_ui_translation">100dp</dimen>
 
     <!-- Dialog dimensions.
          https://www.google.com/design/spec/components/dialogs.html#dialogs-simple-dialogs -->
     <dimen name="dialog_width_unit">56dp</dimen>  <!-- MD dialog widths are multiples of this. -->
 </resources>