dart2js: Use computed classes/statics from code-emitter-task in new emitter.

sdk/lib/_internal/compiler/implementation/js_emitter/registry.dart

Index: sdk/lib/_internal/compiler/implementation/js_emitter/registry.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_emitter/registry.dart b/sdk/lib/_internal/compiler/implementation/js_emitter/registry.dart
index ee992647d30c4fcbb3446ef3b9e5ead398288a42..a0a078dac9352319bfb1e1e5b0027bb4d55e4c4f 100644
--- a/sdk/lib/_internal/compiler/implementation/js_emitter/registry.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_emitter/registry.dart
@@ -64,22 +64,26 @@ class Registry {
   bool get _isProgramSplit => _deferredLoadTask.isProgramSplit;
   OutputUnit get _mainOutputUnit => _deferredLoadTask.mainOutputUnit;
 
-  Fragment _computeTargetFragment(Element element) {
+  Fragment _mapUnitToFragment(OutputUnit targetUnit) {
     if (mainFragment == null) {
       mainFragment = new Fragment.main(_deferredLoadTask.mainOutputUnit);
     }
-    if (!_isProgramSplit) return mainFragment;
-    OutputUnit targetUnit = _deferredLoadTask.outputUnitForElement(element);
+    if (!_isProgramSplit) {
+      assert(targetUnit == _deferredLoadTask.mainOutputUnit);
+      return mainFragment;
+    }
     if (targetUnit == _mainOutputUnit) return mainFragment;
     String name = targetUnit.name;
     return _deferredFragmentsMap.putIfAbsent(
         targetUnit, () => new Fragment.deferred(targetUnit, name));
   }
 
-  /// Adds the element to the list of elements of the library in the right
-  /// fragment.
-  void registerElement(Element element) {
-    _computeTargetFragment(element).add(element.library, element);
+  /// Adds all elements to their respective libraries in the correct fragment.
+  void registerElements(OutputUnit outputUnit, List<Element> elements) {
+    Fragment targetFragment = _mapUnitToFragment(outputUnit);
+    for (Element element in Elements.sortedByPosition(elements)) {
+      targetFragment.add(element.library, element);
+    }
   }
 
   Holder registerHolder(String name) {