merge to trunk all changes from 36817 until 37378 under the packages: polymer,

pkg/polymer_expressions/test/bindings_test.dart

Index: pkg/polymer_expressions/test/bindings_test.dart
===================================================================
--- pkg/polymer_expressions/test/bindings_test.dart	(revision 37373)
+++ pkg/polymer_expressions/test/bindings_test.dart	(working copy)
@@ -22,6 +22,7 @@
 
 main() => dirtyCheckZone().run(() {
   useHtmlConfiguration();
+  smoke.useMirrors();
 
   group('bindings', () {
     var stop = null;
@@ -45,6 +46,23 @@
       });
     });
 
+    // regression test for issue 19296
+    test('should not throw when data changes', () {
+      var model = new NotifyModel();
+      var tag = new Element.html('<template>'
+          '<template repeat="{{ i in x }}">{{ i }}</template></template>');
+      TemplateBindExtension.bootstrap(tag);
+      var template = templateBind(tag);
+      testDiv.append(template.createInstance(model, new PolymerExpressions()));
+
+      return new Future(() {
+        model.x = [1, 2, 3];
+      }).then(_nextMicrotask).then((_) {
+        expect(testDiv.text,'123');
+      });
+    });
+
+
     test('should update text content when data changes', () {
       var model = new NotifyModel('abcde');
       var tag = new Element.html(