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

chrome/browser/resources/ntp4/recently_closed.css

Index: chrome/browser/resources/ntp4/recently_closed.css
diff --git a/chrome/browser/resources/ntp4/recently_closed.css b/chrome/browser/resources/ntp4/recently_closed.css
index 6ea29594012053061bfd8a7e99633d5e12ca6564..60b7b8d26c5211744f2f396da603b03eb4e510c3 100644
--- a/chrome/browser/resources/ntp4/recently_closed.css
+++ b/chrome/browser/resources/ntp4/recently_closed.css
@@ -22,6 +22,12 @@
   -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;
 }
@@ -107,3 +113,22 @@ html[dir='rtl'] .recent-menu-item {
   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;
+}