Fast NTP support for themes, dark themes, favicons.

chrome/browser/resources/local_ntp/most_visited_single.css

 /* Copyright 2015 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. */
 
 body {
   -webkit-user-select: none;
   background: none transparent;
+  color: #323232;
   margin: 0;
   overflow: hidden;
   padding: 0;
 }
 
 a {
   display: block;
 }
 
 a,
@@ skipping 22 matching lines @@
   /* This align correctly for both LTR and RTL */
   text-align: -webkit-auto;
   transition: opacity 1s;
 }
 
 .mv-tile,
 .mv-empty-tile {
   background: rgb(242,242,242);
   border: 1px solid transparent;
   border-radius: 2px;
-  color: #323232;
   display: inline-block;
   font-family: arial, sans-serif;
   font-size: 12px;
   height: calc(130px - 2px);
   line-height: 100%;
   margin: 0 8px;
   opacity: 1;
   outline: 0;
   overflow: hidden;
   position: relative;
@@ skipping 75 matching lines @@
     linear-gradient(to left, black, black, 100px, transparent);
   right: 31px;
   text-align: right;
 }
 
 .mv-thumb {
   border: none;
   border-radius: 0;
   cursor: pointer;
   display: block;
-  height: 90px;
+  height: 94px;
   left: 3px;
+  overflow: hidden;
   position: absolute;
   top: 31px;
   width: 148px;
 }
 
 .mv-thumb img {
-  height: 94px;
-  width: 148px;
+  height: auto;
+  min-height: 100%;
+  width: 100%;
 }
 
 .mv-thumb.failed-img {
   background-color: #fff;
   height: 94px;
   width: 148px;
 }
 
 /*
   We use ::after without content to provide an aditional element on top of
@@ skipping 85 matching lines @@
   background-image: -webkit-image-set(
       url(chrome-search://local-ntp/images/ntp_default_favicon.png) 1x,
       url(chrome-search://local-ntp/images/ntp_default_favicon.png@2x) 2x);
   background-repeat: no-repeat;
   background-size: 16px 16px;
 }
 
 .mv-favicon.failed-favicon img {
   display: none;
 }