webapps: add splashscreen for installed webapps

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 139 matching lines @@
     <!-- Sign-in promo dimensions -->
     <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>
-    
+
     <!-- Alert dialog -->
     <dimen name="dialog_padding_top">@dimen/abc_dialog_padding_top_material</dimen>
     <dimen name="dialog_padding_sides">@dimen/abc_dialog_padding_material</dimen>
 
     <!-- Tab Strip Dimensions -->
     <dimen name="tab_strip_height">0dp</dimen>
 
     <!-- Full Screen Dimensions -->
     <!-- Should match toolbar_height_no_shadow -->
     <dimen name="control_container_height">56dp</dimen>
@@ skipping 15 matching lines @@
     <dimen name="find_result_bar_result_min_height">8px</dimen>
     <dimen name="find_result_bar_active_min_height">16px</dimen>
     <dimen name="find_result_bar_vertical_padding">8px</dimen>
     <dimen name="find_result_bar_min_gap_between_stacks">3px</dimen>
     <dimen name="find_result_bar_stacked_result_height">3px</dimen>
     <dimen name="find_in_page_separator_width">1dp</dimen>
     <dimen name="find_in_page_popup_width">375dp</dimen>
     <dimen name="find_in_page_popup_height">60dp</dimen>
     <dimen name="find_in_page_popup_margin_end">62dp</dimen>
 
+    <!-- WebApp dimensions -->
+    <dimen name="webapp_icon_size">128dp</dimen>
+    <dimen name="webapp_splash_title_bottom_margin">64dp</dimen>
+    <dimen name="webapp_splash_title_size">24sp</dimen>
+
     <!-- Toolbar dimensions -->
     <dimen name="toolbar_tab_count_text_size_1_digit">12dp</dimen>
     <dimen name="toolbar_tab_count_text_size_2_digit">10dp</dimen>
     <dimen name="toolbar_height_no_shadow">56dp</dimen>
 
     <dimen name="location_bar_margin_top">5dp</dimen>
     <dimen name="location_bar_margin_bottom">5dp</dimen>
 
     <dimen name="toolbar_edge_padding">8dp</dimen>
     <dimen name="location_bar_url_text_size">17sp</dimen>
@@ skipping 75 matching lines @@
 
     <!-- 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="menu_footer_height">28dp</dimen>
 </resources>