Prepare for decoupling analyzer ASTs from element model.

pkg/analysis_server/lib/src/operation/operation_analysis.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 operation.analysis;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/computer/computer_highlights.dart';
 import 'package:analysis_server/src/computer/computer_highlights2.dart';
 import 'package:analysis_server/src/computer/computer_outline.dart';
 import 'package:analysis_server/src/computer/computer_overrides.dart';
 import 'package:analysis_server/src/domains/analysis/implemented_dart.dart';
 import 'package:analysis_server/src/domains/analysis/navigation.dart';
 import 'package:analysis_server/src/domains/analysis/occurrences.dart';
 import 'package:analysis_server/src/operation/operation.dart';
 import 'package:analysis_server/src/protocol_server.dart' as protocol;
 import 'package:analysis_server/src/services/dependencies/library_dependencies.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/ast/resolution_accessors.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 
 /**
  * Run the given function [f] with the given [context] made active.
  * Return the result of [f] invocation.
  */
 runWithActiveContext(AnalysisContext context, f()) {
@@ skipping 34 matching lines @@
     }
   }
 }
 
 /**
  * Schedules indexing of the given [file] using the resolved [dartUnit].
  */
 void scheduleIndexOperation(
     AnalysisServer server, String file, CompilationUnit dartUnit) {
   if (server.index != null) {
-    AnalysisContext context = dartUnit.element.context;
+    AnalysisContext context = elementForCompilationUnit(dartUnit).context;
     server.addOperation(new _DartIndexOperation(context, file, dartUnit));
   }
 }
 
 /**
  * Schedules sending notifications for the given [file] using the resolved
  * [resolvedDartUnit].
  */
 void scheduleNotificationOperations(
     AnalysisServer server,
@@ skipping 451 matching lines @@
 abstract class _SingleFileOperation extends SourceSensitiveOperation {
   final String file;
 
   _SingleFileOperation(AnalysisContext context, this.file) : super(context);
 
   @override
   bool shouldBeDiscardedOnSourceChange(Source source) {
     return source.fullName == file;
   }
 }