Add CompilationUnitElement.lineInfo and resynthesize it.

pkg/analyzer/lib/src/dart/element/handle.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.generated.element_handle;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/constant/value.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 191 matching lines @@
   List<FunctionTypeAliasElement> get functionTypeAliases =>
       actualElement.functionTypeAliases;
 
   @override
   bool get hasLoadLibraryFunction => actualElement.hasLoadLibraryFunction;
 
   @override
   ElementKind get kind => ElementKind.COMPILATION_UNIT;
 
   @override
+  LineInfo get lineInfo => actualElement.lineInfo;
+
+  @override
   Source get source => actualElement.source;
 
   @override
   List<TopLevelVariableElement> get topLevelVariables =>
       actualElement.topLevelVariables;
 
   @override
   List<ClassElement> get types => actualElement.types;
 
   @override
@@ skipping 898 matching lines @@
 
   @override
   bool get isStatic => actualElement.isStatic;
 
   @override
   DartType get type => actualElement.type;
 
   @override
   DartObject computeConstantValue() => actualElement.computeConstantValue();
 }