Add CompilationUnitElement.lineInfo and resynthesize it.

pkg/analyzer/lib/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.
 
 /**
  * Defines the element model. The element model describes the semantic (as
  * opposed to syntactic) structure of Dart code. The syntactic structure of the
  * code is modeled by the [AST structure](../ast/ast.dart).
  *
  * The element model consists of two closely related kinds of objects: elements
@@ skipping 435 matching lines @@
    */
   List<FunctionTypeAliasElement> get functionTypeAliases;
 
   /**
    * Return `true` if this compilation unit defines a top-level function named
    * `loadLibrary`.
    */
   bool get hasLoadLibraryFunction;
 
   /**
+   * Return the [LineInfo] for the [source], or `null` if not computed yet.
+   */
+  LineInfo get lineInfo;
+
+  /**
    * Return a list containing all of the top-level variables contained in this
    * compilation unit.
    */
   List<TopLevelVariableElement> get topLevelVariables;
 
   /**
    * Return a list containing all of the classes contained in this compilation
    * unit.
    */
   List<ClassElement> get types;
@@ skipping 246 matching lines @@
    *
    * This method is expensive, because resolved AST might have been already
    * evicted from cache, so parsing and resolving will be performed.
    */
   CompilationUnit get unit;
 
   /**
    * Use the given [visitor] to visit this element. Return the value returned by
    * the visitor as a result of visiting this element.
    */
-  /*=T*/ accept/*<T>*/(ElementVisitor<dynamic/*=T*/> visitor);
+  /*=T*/ accept/*<T>*/(ElementVisitor<dynamic/*=T*/ > visitor);
 
   /**
    * Return the documentation comment for this element as it appears in the
    * original source (complete with the beginning and ending delimiters), or
    * `null` if this element does not have a documentation comment associated
    * with it. This can be a long-running operation if the information needed to
    * access the comment is not cached.
    *
    * Throws [AnalysisException] if the documentation comment could not be
    * determined because the analysis could not be performed
@@ skipping 1312 matching lines @@
   DartType get type;
 
   /**
    * Return a representation of the value of this variable, forcing the value
    * to be computed if it had not previously been computed, or `null` if either
    * this variable was not declared with the 'const' modifier or if the value of
    * this variable could not be computed because of errors.
    */
   DartObject computeConstantValue();
 }