MD Settings: Skip unseen collapse animation

chrome/browser/resources/settings/settings_page/settings_section.js

Index: chrome/browser/resources/settings/settings_page/settings_section.js
diff --git a/chrome/browser/resources/settings/settings_page/settings_section.js b/chrome/browser/resources/settings/settings_page/settings_section.js
index 7833f39ba8b31db0bb47bbe0c20c88c58ed6ad2b..0fe5074c402cd2e6589aa2f8336bd544e71b4466 100644
--- a/chrome/browser/resources/settings/settings_page/settings_section.js
+++ b/chrome/browser/resources/settings/settings_page/settings_section.js
@@ -139,7 +139,10 @@ var SettingsSectionElement = Polymer({
     return animation;
   },
 
-  /** @return {boolean} True if the section is currently expanded. */
+  /**
+   * @return {boolean} True if the section is currently expanded and we know
+   *     what the collapsed height should be.
+   */
   canAnimateCollapse: function() {
     return this.classList.contains('expanded') && this.clientHeight > 0 &&
         !Number.isNaN(this.collapsedHeight_);