NTP4: Making tiles on the NTP printable.

chrome/browser/resources/ntp4/tile_page.css

 /* Copyright (c) 2011 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.
  */
 
 .tile-page {
   display: -webkit-box;
   height: 100%;
   position: relative;
   width: 100%;
@@ skipping 34 matching lines @@
 
 .tile-grid {
   overflow: hidden;
   position: relative;
   width: 100%;
 }
 
 .tile {
   display: inline-block;
   position: absolute;
+  -webkit-print-color-adjust: exact;
   /* Don't offer the context menu on long-press. */
   -webkit-touch-callout: none;
   -webkit-user-drag: element;
 }
 
 /* I don't know why this is necessary. -webkit-user-drag: element on .tile
  * should be enough. If we don't do this, we get 2 drag representations for
  * the image. */
 .tile img {
   -webkit-user-drag: none;
@@ skipping 97 matching lines @@
 
 /** Scrollbars ****************************************************************/
 
 .tile-page-content::-webkit-scrollbar {
   width: 13px;
 }
 
 .tile-page-content::-webkit-scrollbar-button {
   display: none;
 }