Roll polymer packages to version 0.3.4

pkg/polymer/test/unbind_test.dart

Index: pkg/polymer/test/unbind_test.dart
diff --git a/pkg/polymer/test/unbind_test.dart b/pkg/polymer/test/unbind_test.dart
index 8bf725666e47d1fc86e88ed80355dd4958302ec7..13d80ef289c4c6cde3c0983b3fcf36e1c69b64ce 100644
--- a/pkg/polymer/test/unbind_test.dart
+++ b/pkg/polymer/test/unbind_test.dart
@@ -64,8 +64,12 @@ delay(x) => new Future.delayed(new Duration(milliseconds: 50), () => x);
 // TODO(jmesserly): fix this when it's easier to get a private symbol.
 final unboundSymbol = reflectClass(Polymer).declarations.keys
     .firstWhere((s) => MirrorSystem.getName(s) == '_unbound');
+final observersSymbol = reflectClass(Polymer).declarations.keys
+    .firstWhere((s) => MirrorSystem.getName(s) == '_observers');
 
 _unbound(node) => reflect(node).getField(unboundSymbol).reflectee;
+_observerCount(node) =>
+    reflect(node).getField(observersSymbol).reflectee.length;
 
 unbindTests() {
   var xTest = document.querySelector('x-test');
@@ -77,38 +81,48 @@ unbindTests() {
         'element is bound when inserted');
     expect(xTest.fooWasChanged, true, reason:
         'element is actually bound');
+    // Dart note: we don't have a way to check for the global count of
+    // observables/bindables, so we just check the count in the node.
+    expect(_observerCount(xTest), greaterThan(0));
     xTest.remove();
   }).then(delay).then((_) {
     expect(_unbound(xTest), true, reason:
         'element is unbound when removed');
+    expect(_observerCount(xTest), 0);
     return new XTest();
   }).then(delay).then((node) {
     expect(_unbound(node), null, reason:
         'element is bound when not inserted');
     node.foo = 'bar';
+    expect(_observerCount(node), greaterThan(0));
     scheduleMicrotask(Observable.dirtyCheck);
     return node;
   }).then(delay).then((node) {
     expect(node.fooWasChanged, true, reason: 'node is actually bound');
+    node.unbindAll();
     var n = new XTest();
     n.cancelUnbindAll();
     return n;
   }).then(delay).then((node) {
     expect(_unbound(node), null, reason:
         'element is bound when cancelUnbindAll is called');
+    expect(_observerCount(node), greaterThan(0));
     node.unbindAll();
     expect(_unbound(node), true, reason:
         'element is unbound when unbindAll is called');
+    expect(_observerCount(node), 0);
     var n = new XTest()..id = 'foobar!!!';
     document.body.append(n);
     return n;
   }).then(delay).then((node) {
     expect(_unbound(node), null, reason:
         'element is bound when manually inserted');
+    expect(_observerCount(node), greaterThan(0));
     node.remove();
     return node;
   }).then(delay).then((node) {
     expect(_unbound(node), true, reason:
         'element is unbound when manually removed is called');
+    expect(_observerCount(node), 0);
   });
 }