Upgrade to 1.0 and switch clients to dom-repeat where needed.

third_party/polymer/v0_8/components-chromium/neon-animation/animations/hero-animation-extracted.js

+
+
+  Polymer({
+
+    is: 'hero-animation',
+
+    behaviors: [
+      Polymer.NeonSharedElementAnimationBehavior
+    ],
+
+    configure: function(config) {
+      var shared = this.findSharedElements(config);
+      if (!shared) {
+        return null;
+      }
+
+      var fromRect = shared.from.getBoundingClientRect();
+      var toRect = shared.to.getBoundingClientRect();
+
+      var deltaLeft = fromRect.left - toRect.left;
+      var deltaTop = fromRect.top - toRect.top;
+      var deltaWidth = fromRect.width / toRect.width;
+      var deltaHeight = fromRect.height / toRect.height;
+
+      this.setPrefixedProperty(shared.to, 'transformOrigin', '0 0');
+      shared.to.style.zIndex = 10000;
+      shared.from.style.visibility = 'hidden';
+
+      this._effect = new KeyframeEffect(shared.to, [
+        {'transform': 'translate(' + deltaLeft + 'px,' + deltaTop + 'px) scale(' + deltaWidth + ',' + deltaHeight + ')'},
+        {'transform': 'none'}
+      ], this.timingFromConfig(config));
+
+      return this._effect;
+    },
+
+    complete: function(config) {
+      var shared = this.findSharedElements(config);
+      if (!shared) {
+        return null;
+      }
+      shared.to.style.zIndex = '';
+      shared.from.style.visibility = '';
+    }
+
+  });
+