Print Preview: Preventing "Preview loading..." animation from rendering when not displayed.

chrome/browser/resources/print_preview.css

 html {
   height: 100%;
 }
 
 body {
   background: white;
   display: -webkit-box;
   height: 100%;
   margin: 0;
   overflow: hidden;
@@ skipping 637 matching lines @@
 }
 
 #no-plugin {
   padding: 20px;
 }
 
 .hidden {
   display: none;
 }
 
-#dancing-dots {
+#overlay-layer {
   -webkit-transition: opacity 0.5s linear;
   -webkit-user-select: none;
   background: -webkit-radial-gradient(#eaeaea, #b8b8b8);
   height: 100%;
   margin: 0;
   opacity: 1;
   position: absolute;
   width: 100%;
 }
 
-#dancing-dots.invisible {
+#overlay-layer.invisible {
   -webkit-transition: opacity 0.7s linear;
   opacity: 0;
   pointer-events: none;
 }
 
 #messages {
   color: #404040;
   font-size: 15px;
   position: relative;
   text-align: center;
@@ skipping 35 matching lines @@
   -webkit-animation-delay: 300ms;
 }
 
 #two-sided-div {
   margin-top: 10px;
 }
 
 input[disabled] + label {
   color: gray;
 }