Support multiple resolution inputs from command line.

pkg/compiler/lib/src/serialization/modelz.dart

 // Copyright (c) 2015, 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.
 
 /// Implementation of the element model used for deserialiation.
 ///
 /// These classes are created by [ElementDeserializer] triggered by the
 /// [Deserializer].
 
 library dart2js.serialization.modelz;
@@ skipping 353 matching lines @@
   @override
   ElementKind get kind => ElementKind.LIBRARY;
 
   @override
   Element get enclosingElement => null;
 
   @override
   String get name => entryCompilationUnit.name;
 
   @override
+  SourceSpan get sourcePosition => entryCompilationUnit.sourcePosition;
+
+  @override
   accept(ElementVisitor visitor, arg) {
     return visitor.visitLibraryElement(this, arg);
   }
 
   @override
   LibraryElement get library => this;
 
   @override
   CompilationUnitElement get compilationUnit => entryCompilationUnit;
 
@@ skipping 165 matching lines @@
 
   @override
   ElementKind get kind => ElementKind.COMPILATION_UNIT;
 
   @override
   CompilationUnitElement get compilationUnit => this;
 
   @override
   Element get enclosingElement => library;
 
+
+  @override
+  SourceSpan get sourcePosition => new SourceSpan(script.resourceUri, 0, 0);
+
   @override
   accept(ElementVisitor visitor, arg) {
     return visitor.visitCompilationUnitElement(this, arg);
   }
 
   @override
   void forEachLocalMember(f(Element element)) {
     if (_members == null) {
       _members = _decoder.getElements(Key.ELEMENTS, isOptional: true);
     }
@@ skipping 1580 matching lines @@
   }
 
   @override
   ElementKind get kind => ElementKind.PREFIX;
 
   @override
   Element lookupLocalMember(String memberName) {
     return _unsupported('lookupLocalMember');
   }
 }