[NTP4] Experiment for adding Chrome Web Store link to footer.

chrome/browser/resources/ntp4/recently_closed.css

 /* Copyright (c) 2012 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. */
 
 #recently-closed-menu-button {
   -webkit-padding-end: 15px;
   -webkit-padding-start: 9px;
   background: none;
   border: 0;
   color: #7F7F7F;
   cursor: pointer;
   display: block;
   margin: 0;
   font-size: 9pt;
   font-weight: bold;
   height: 100%;
   /* The padding increases the clickable area. */
   padding-bottom: 0;
   padding-top: 0;
   -webkit-appearance: none;
   -webkit-transition: opacity 200ms;
   -webkit-transition-delay: 100ms;
 }
 
+.enable-cws-experiment #recently-closed-menu-button {
+  position: relative;
+  -webkit-margin-end: 0;
+  -webkit-padding-end: 16px;
+}
+
 #recently-closed-menu-button:hover:not([menu-shown]) {
   color: #666;
 }
 
 #recently-closed-menu-button:hover:not([menu-shown]) .disclosure-triangle {
   background-color: #666;
 }
 
 #recently-closed-menu-button[menu-shown] {
   color: #555;
@@ skipping 65 matching lines @@
   color: hsl(213, 90%, 24%) !important;
 }
 
 .disclosure-triangle {
   background-color: #7F7F7F;
   display: inline-block;
   height: 9px;
   width: 9px;
   -webkit-mask-image: url('images/disclosure_triangle_mask.png');
 }
+
+#vertical-separator {
+  background-color: #B2B2B2;
+  display: none;
+  height: 20px;
+  position: absolute;
+  right: 0;
+  top: 14px;
+  width: 1px;
+}
+
+html[dir="rtl"] #vertical-separator {
+  left: 0;
+  right: auto;
+}
+
+.enable-cws-experiment #vertical-separator {
+  display: inline-block;
+}