big update to observe, template_binding, polymer

pkg/polymer/lib/src/loader.dart

Index: pkg/polymer/lib/src/loader.dart
diff --git a/pkg/polymer/lib/src/loader.dart b/pkg/polymer/lib/src/loader.dart
index 28adf3dcf6832c511c0cb8c6125e50bf0b46e3f0..73dcb68e2610a73d5937e96126e626fc3269e6c7 100644
--- a/pkg/polymer/lib/src/loader.dart
+++ b/pkg/polymer/lib/src/loader.dart
@@ -47,8 +47,11 @@ Zone initPolymer() {
  * automatically invokes [Observable.dirtyCheck], and the list of libraries must
  * be supplied instead of being dynamically searched for at runtime.
  */
-// TODO(jmesserly): change the Polymer build step to call this directly.
 void _initPolymerOptimized() {
+  // TODO(jmesserly): there is some code in src/declaration/polymer-element.js,
+  // git version 37eea00e13b9f86ab21c85a955585e8e4237e3d2, right before
+  // it registers polymer-element, which uses Platform.deliverDeclarations to
+  // coordinate with HTML Imports. I don't think we need it so skipping.
   document.register(PolymerDeclaration._TAG, PolymerDeclaration);
 
   _loadLibraries();