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

chrome/browser/resources/print_preview_animations.js

Index: chrome/browser/resources/print_preview_animations.js
diff --git a/chrome/browser/resources/print_preview_animations.js b/chrome/browser/resources/print_preview_animations.js
index 634fe7ac0965826ffde69b1238b6505b6f0504f5..ed92490fee295b26eb54d91e2c4da5585562bbc6 100644
--- a/chrome/browser/resources/print_preview_animations.js
+++ b/chrome/browser/resources/print_preview_animations.js
@@ -44,3 +44,20 @@ function fadeOutElement(el) {
   el.classList.add('closing');
   el.classList.remove('visible');
 }
+
+function showLoadingAnimation() {
+  $('dancing-dots-text').classList.remove('hidden');
+  $('overlay-layer').classList.remove('invisible');
+}
+
+function hideLoadingAnimation() {
+  var overlayLayer = $('overlay-layer');
+  overlayLayer.addEventListener('webkitTransitionEnd', loadingAnimationCleanup);
+  overlayLayer.classList.add('invisible');
+}
+
+function loadingAnimationCleanup() {
+  $('dancing-dots-text').classList.add('hidden');
+  $('overlay-layer').removeEventListener('webkitTransitionEnd',
+                                         loadingAnimationCleanup);
+}