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

pkg/analyzer_plugin/test/support/abstract_context.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async';
 
 import 'package:analyzer/dart/analysis/session.dart';
 import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/visitor.dart';
 import 'package:analyzer/exception/exception.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/dart/analysis/file_state.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/engine.dart' as engine;
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source_io.dart';
+import 'package:analyzer/src/generated/testing/element_search.dart';
 import 'package:front_end/src/base/performace_logger.dart';
 import 'package:front_end/src/incremental/byte_store.dart';
 
 import 'mock_sdk.dart';
 
 /**
  * Finds an [Element] with the given [name].
  */
 Element findChildElement(Element root, String name, [ElementKind kind]) {
   Element result = null;
   root.accept(new _ElementVisitorFunctionWrapper((Element element) {
     if (element.name != name) {
       return;
     }
     if (kind != null && element.kind != kind) {
       return;
     }
     result = element;
   }));
   return result;
 }
 
 /**
- * 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;
-}
-
-/**
  * A function to be called for every [Element].
  */
 typedef void _ElementVisitorFunction(Element element);
 
 class AbstractContextTest {
   MemoryResourceProvider provider;
   DartSdk sdk;
   Map<String, List<Folder>> packageMap;
   UriResolver resourceResolver;
 
@@ skipping 118 matching lines @@
 
   @override
   void logInformation(String message, [CaughtException exception]) {
     print(message);
     if (exception != null) {
       print(exception);
     }
   }
 }
 
-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);
-    }
-  }
-}
-
 /**
  * Wraps the given [_ElementVisitorFunction] into an instance of
  * [engine.GeneralizingElementVisitor].
  */
 class _ElementVisitorFunctionWrapper extends GeneralizingElementVisitor {
   final _ElementVisitorFunction function;
 
   _ElementVisitorFunctionWrapper(this.function);
 
   @override
   visitElement(Element element) {
     function(element);
     super.visitElement(element);
   }
 }