Roll third_party/polymer.

third_party/polymer/v1_0/components-chromium/iron-collapse/iron-collapse-extracted.js

Index: third_party/polymer/v1_0/components-chromium/iron-collapse/iron-collapse-extracted.js
diff --git a/third_party/polymer/v1_0/components-chromium/iron-collapse/iron-collapse-extracted.js b/third_party/polymer/v1_0/components-chromium/iron-collapse/iron-collapse-extracted.js
index df3d392b22609d33dcfe1812bd16e8a65cf2568f..9e5f2aa6f5b7772555c95321167e71254f7b8cdb 100644
--- a/third_party/polymer/v1_0/components-chromium/iron-collapse/iron-collapse-extracted.js
+++ b/third_party/polymer/v1_0/components-chromium/iron-collapse/iron-collapse-extracted.js
@@ -86,7 +86,7 @@ Polymer({
 
       this._updateTransition(false);
       // If we can animate, must do some prep work.
-      if (animated && !this.noAnimation) {
+      if (animated && !this.noAnimation && this._isDisplayed) {
         // Animation will start at the current size.
         var startSize = this._calcSize();
         // For `auto` we must calculate what is the final size for the animation.
@@ -157,6 +157,19 @@ Polymer({
       this.notifyResize();
     },
 
+    /**
+     * Simplistic heuristic to detect if element has a parent with display: none
+     *
+     * @private
+     */
+    get _isDisplayed() {
+      var rect = this.getBoundingClientRect();
+      for (var prop in rect) {
+        if (rect[prop] !== 0) return true;
+      }
+      return false;
+    },
+
     _calcSize: function() {
       return this.getBoundingClientRect()[this.dimension] + 'px';
     }