Merge pull request #1 from PolymerElements/fix-async-attached-detached

Sprinkle some of that magic polyfill dust on it.

Author: cdata

test-fixture.html

@@ -39,6 +39,8 @@
         );
       }, this);
 
+      this.forcePolyfillAttachedStateSynchrony();
+
       if (generatedDoms.length < 2) {
         return generatedDoms[0];
       }
@@ -89,6 +91,17 @@
       this.generatedDomStack = [];
 
       this._elementsFixtured = false;
+
+      this.forcePolyfillAttachedStateSynchrony();
+    },
+
+    forcePolyfillAttachedStateSynchrony: function () {
+      // Force synchrony in attachedCallback and detachedCallback where
+      // implemented, in the event that we are dealing with the async Web
+      // Components Polyfill.
+      if (window.CustomElements && window.CustomElements.takeRecords) {
+        window.CustomElements.takeRecords();
+      }
     },
 
     collectElementChildren: function (parent) {

test/test-fixture.html

@@ -91,10 +91,7 @@
       attachedFixture.restore();
     });
 
-    // TODO(cdata): Make this test pass somehow. Currently it fails in
-    // not-Chrome due to an implementation detail of the Web Components
-    // polyfill.
-    xit('detaches the fixtured DOM when it is restored', function () {
+    it('detaches the fixtured DOM when it is restored', function () {
       var detached = false;
 
       element.onDetached = function () {