Add CompilationUnitElement.lineInfo and resynthesize it.

pkg/analyzer/lib/src/dart/element/element.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.
 
 library analyzer.src.dart.element.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 1282 matching lines @@
    * The unlinked representation of the part in the summary.
    */
   final UnlinkedPart _unlinkedPart;
 
   /**
    * The source that corresponds to this compilation unit.
    */
   @override
   Source source;
 
+  @override
+  LineInfo lineInfo;
+
   /**
    * The source of the library containing this compilation unit.
    *
    * This is the same as the source of the containing [LibraryElement],
    * except that it does not require the containing [LibraryElement] to be
    * computed.
    */
   Source librarySource;
 
   /**
@@ skipping 7330 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }