Move findElementsByName() into shared analyzer/element_search.dart file.

pkg/analyzer/test/utils.dart

 // Copyright (c) 2013, 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.test.utils;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
-import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/generated/resolver.dart' show TypeProvider;
+import 'package:analyzer/src/generated/testing/element_search.dart';
 import 'package:front_end/src/base/source.dart';
 import 'package:test/test.dart';
 
 /**
- * Search the [unit] for the [Element]s with the given [name].
- */
-List<Element> findElementsByName(CompilationUnit unit, String name) {
-  var finder = new _ElementsByNameFinder(name);
-  unit.accept(finder);
-  return finder.elements;
-}
-
-/**
  * Search the [unit] for the [LocalVariableElement] with the given [name].
  * Fail if there is not exactly one such variable.
  */
 LocalVariableElement findLocalVariable(CompilationUnit unit, String name) {
-  var finder = new _ElementsByNameFinder(name);
-  unit.accept(finder);
+  List<Element> elements = findElementsByName(unit, name);
   List<Element> localVariables =
-      finder.elements.where((e) => e is LocalVariableElement).toList();
+      elements.where((e) => e is LocalVariableElement).toList();
   expect(localVariables, hasLength(1));
   return localVariables[0];
 }
 
 /**
  * The type of an assertion which asserts properties of [T]s.
  */
 typedef void Asserter<T>(T type);
 
 /**
@@ skipping 282 matching lines @@
           Asserter<DartType> argAssert0, Asserter<DartType> argAssert1) =>
       isInstantiationOf(isMap)([argAssert0, argAssert1]);
 
   /**
    * Assert that a type is equal to the [expected].
    */
   Asserter<DartType> isType(DartType expected) => (DartType t) {
         expect(t, expected);
       };
 }
-
-class _ElementsByNameFinder extends RecursiveAstVisitor<Null> {
-  final String name;
-  final List<Element> elements = [];
-
-  _ElementsByNameFinder(this.name);
-
-  @override
-  visitSimpleIdentifier(SimpleIdentifier node) {
-    if (node.name == name && node.inDeclarationContext()) {
-      elements.add(node.staticElement);
-    }
-  }
-}