big update to observe, template_binding, polymer

pkg/polymer/test/attr_mustache_test.dart

Index: pkg/polymer/test/attr_mustache_test.dart
diff --git a/pkg/polymer/test/attr_mustache_test.dart b/pkg/polymer/test/attr_mustache_test.dart
index 8f2cae1f0c65e7777fb092fa0ccc5fed0a88b149..45da52523e279d8af2411a2abd654cd51b6fd4fd 100644
--- a/pkg/polymer/test/attr_mustache_test.dart
+++ b/pkg/polymer/test/attr_mustache_test.dart
@@ -17,8 +17,8 @@ class XTarget extends PolymerElement {
   Future get foundSrc => _found.future;
 
   // force an mdv binding
-  bind(name, model, [path]) =>
-      nodeBindFallback(this).bind(name, model, path);
+  bind(name, value, {oneTime: false}) =>
+      nodeBindFallback(this).bind(name, value, oneTime: oneTime);
 
   inserted() {
     testSrcForMustache();