Add theme promo to NTP

chrome/browser/resources/new_new_tab.css

 html {
   /* This is needed because of chrome://theme/css/new_tab.css */
   height: 100%;
 }
 
 body {
   margin: 0;
 }
 
 #main {
@@ skipping 683 matching lines @@
 #t4, #t5, #t6, #t7 {
   top: 183px;
 }
 
 /* tip line */
 #tip-line {
   margin: 10px 0;
   text-align: center;
 }
 
+#themes-promo {
+  position: absolute;
+  bottom: 0px;
+  right: 0px;
+}
+
+#themes-promo * {
+  display: block;
+}
+
+#themes-promo img {
+  width: 150px;
+  height: 180px;
+  border: 0;
+}
+
 /* small */
 
 @media (max-width: 920px) {
 
   #main {
     width: 692px;
   }
 
   #most-visited {
     height: 294px;
@@ skipping 42 matching lines @@
   #t3, #t7,
   html[dir='rtl'] #t0,
   html[dir='rtl'] #t4 {
     left: 534px;
   }
 
   #t4, #t5, #t6, #t7 {
     top: 147px;
   }
 }