[Contextual Search] Implements Opt-out 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>
     <!-- Website Settings Popup Dimensions -->
     <dimen name="website_settings_popup_padding_sides">16dp</dimen>
     <dimen name="website_settings_popup_button_height">36dp</dimen>
     <dimen name="website_settings_popup_button_padding_sides">8dp</dimen>
@@ skipping 33 matching lines @@
     <dimen name="infobar_touch_target_height">40dp</dimen>
     <!-- Width and height of the infobar icon. -->
     <dimen name="infobar_icon_size">36dp</dimen>
 
     <!-- App banner dimensions -->
     <dimen name="app_banner_icon_size">48dp</dimen>
     <dimen name="app_banner_icon_spacing">16dp</dimen>
 
     <!-- Contextual search dimensions -->
     <dimen name="contextual_search_bar_height">80dp</dimen>
+    <dimen name="contextual_search_text_size">18sp</dimen>
 
     <!-- Password generation popup dimensions -->
     <dimen name="password_generation_divider_height">1dp</dimen>
     <dimen name="password_generation_text_size">14sp</dimen>
     <dimen name="password_generation_horizontal_margin">10dp</dimen>
     <dimen name="password_generation_text_vertical_margin">12dp</dimen>
 
     <!--  Preferences dimensions -->
     <dimen name="pref_autofill_field_horizontal_padding">3dp</dimen>
     <dimen name="pref_autofill_field_top_padding">10dp</dimen>
@@ skipping 60 matching lines @@
     <dimen name="sign_in_promo_padding_bottom">16dp</dimen>
 
     <!-- Autofill card unmasking prompt dimensions -->
     <dimen name="autofill_card_unmask_tooltip_horizontal_padding">16dp</dimen>
     <dimen name="autofill_card_unmask_tooltip_vertical_padding">4dp</dimen>
 
     <!-- Cast related constants -->
     <dimen name="remote_notification_logo_max_width">@android:dimen/notification_large_icon_width</dimen>
     <dimen name="remote_notification_logo_max_height">64dp</dimen>
 </resources>