Add CompilationUnitElement.lineInfo and resynthesize it.

pkg/analyzer/lib/src/summary/resynthesize.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.
 
 library summary_resynthesizer;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
@@ skipping 1490 matching lines @@
 
   _UnitResynthesizer(this.libraryResynthesizer, this.unlinkedUnit,
       this.linkedUnit, Source unitSource, UnlinkedPart unlinkedPart) {
     _resynthesizerContext = new _ResynthesizerContext(this);
     unit = new CompilationUnitElementImpl.forSerialized(
         libraryResynthesizer.library,
         _resynthesizerContext,
         unlinkedUnit,
         unlinkedPart,
         unitSource.shortName);
+
+    {
+      List<int> lineStarts = unlinkedUnit.lineStarts;
+      if (lineStarts.isEmpty) {
+        lineStarts = const <int>[0];
+      }
+      unit.lineInfo = new LineInfo(lineStarts);
+    }
+
     for (EntityRef t in linkedUnit.types) {
       linkedTypeMap[t.slot] = t;
     }
     constCycles = linkedUnit.constCycles.toSet();
     parametersInheritingCovariant =
         linkedUnit.parametersInheritingCovariant.toSet();
     numLinkedReferences = linkedUnit.references.length;
     numUnlinkedReferences = unlinkedUnit.references.length;
     referenceInfos = new List<_ReferenceInfo>(numLinkedReferences);
   }
@@ skipping 406 matching lines @@
   static String _getElementIdentifier(String name, ReferenceKind kind) {
     if (kind == ReferenceKind.topLevelPropertyAccessor ||
         kind == ReferenceKind.propertyAccessor) {
       if (!name.endsWith('=')) {
         return name + '?';
       }
     }
     return name;
   }
 }