Add APIs to cache navigation info and send via callback

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 299 matching lines @@
     <dimen name="bookmark_widget_min_height">48dp</dimen>
 
     <!-- Custom Tabs dimensions -->
     <dimen name="custom_tabs_toolbar_maxWidth">60dp</dimen>
     <dimen name="custom_tabs_toolbar_vertical_padding">16dp</dimen>
     <dimen name="toolbar_icon_height">24dp</dimen>
     <dimen name="min_toolbar_icon_side_padding">6dp</dimen>
     <dimen name="custom_tabs_url_text_size">12sp</dimen>
     <dimen name="custom_tabs_title_text_size">16sp</dimen>
     <dimen name="custom_tabs_bottom_bar_max_height">60dp</dimen>
+    <dimen name="custom_tabs_screenshot_height">300dp</dimen>
+    <dimen name="custom_tabs_screenshot_width">190dp</dimen>
 
     <!-- Favicon dimensions -->
     <dimen name="default_favicon_size">16dp</dimen>
     <dimen name="default_favicon_corner_radius">3dp</dimen>
     <dimen name="default_favicon_icon_text_size">10dp</dimen>
     <dimen name="default_favicon_min_size">16px</dimen>
 
     <!-- Account chooser dialog dimensions -->
     <dimen name="account_chooser_dialog_margin">24dp</dimen>
     <dimen name="account_chooser_dialog_item_margin">20dp</dimen>
@@ skipping 32 matching lines @@
     <dimen name="pref_autofill_field_horizontal_padding">4dp</dimen>
     <dimen name="pref_autofill_field_top_margin">8dp</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. -->
     
     <!-- Downloads dimensions. -->
     <dimen name="downloads_item_icon_size">48dp</dimen>
 </resources>