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

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

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart2js.js_emitter.program_builder;
 
 /// A Fragment maps [LibraryElement]s to their [Element]s.
 ///
 /// Fundamentally, this class nicely encapsulates a
 /// `Map<LibraryElement, List<Element>>`.
@@ skipping 46 matching lines @@
   // Add one for the main fragment.
   int get fragmentCount => _deferredFragmentsMap.length + 1;
 
   Fragment mainFragment;
 
   Registry(this._compiler);
 
   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) {
     return _holdersMap.putIfAbsent(
         name,
         () => new Holder(name, _holdersMap.length));
   }
 }