[Custom Tabs] Implement Bottombar

chrome/android/java/res/values/colors.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>
     <!-- Common colors -->
     <color name="default_text_color">#333</color>
     <color name="default_primary_color">#f2f2f2</color>
     <color name="light_normal_color">#5A5A5A</color>
     <color name="light_active_color">#4285F4</color>
     <color name="input_underline_color">#e5e5e5</color>
     <color name="input_underline_error_color">#d32f2f</color>
     <color name="explanation_text_color">#909090</color>
     <color name="text_highlight_color">#C6DAFC</color>
     <color name="dark_action_bar_color">#263238</color>
+    <color name="toolbar_shadow_color">#1D000000</color>
 
     <!-- Infobar colors -->
     <color name="infobar_accent_blue">#4285f4</color>
     <color name="infobar_descriptive_text_color">#646464</color>
 
     <!-- Snackbar colors -->
     <color name="snackbar_background_color">#282C32</color>
 
     <!-- Tab Switcher Colors -->
     <color name="tab_switcher_background">#14181C</color>
@@ skipping 112 matching lines @@
 
     <!-- WebappActivity colors -->
     <color name="webapp_default_bg">#fafafa</color>
     <color name="webapp_splash_title_light">#ffffff</color>
     <color name="webapp_url_bar_bg">#fafafa</color>
     <color name="webapp_url_bar_separator">#e1e1e1</color>
 
     <!-- Enhanced bookmark UI colors -->
     <color name="enhanced_bookmark_detail_text">#212121</color>
     <color name="enhanced_bookmark_detail_section">#7C7B79</color>
-    <color name="enhanced_bookmark_app_bar_shadow_color">#1D000000</color>
     <color name="enhanced_bookmark_drawer_selected_background_color">#F0F0F0</color>
     <color name="enhanced_bookmark_list_item_highlight_color">#804281f4</color>
     <color name="enhanced_bookmark_icon_background_color">#ff787878</color>
     <color name="enhanced_bookmark_appbar_background">@color/default_primary_color</color>
 
     <!-- Opt out promo -->
     <color name="opt_out_text_color">#646464</color>
 
     <!-- Media UI Colors -->
     <color name="media_session_icon_color">#14181C</color>
 
     <!-- Smart Lock for Passwords UI colors-->
     <color name="smart_lock_auto_signin_snackbar_background_color">#2196F3</color>
 
     <!-- Physical Web colors -->
     <color name="physical_web_header_color">#333</color>
     <color name="physical_web_url_color">#969696</color>
     <color name="physical_web_url_description_color">#646464</color>
     <color name="physical_web_logo_gray_tint">#ccc</color>
 </resources>