Update the plugin API

pkg/analyzer_plugin/lib/src/utilities/fixes/fixes.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 'package:analyzer/dart/analysis/results.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer_plugin/protocol/protocol_generated.dart';
 import 'package:analyzer_plugin/utilities/analyzer_converter.dart';
 import 'package:analyzer_plugin/utilities/fixes/fixes.dart';
 
 /**
+ * A concrete implementation of [DartFixesRequest].
+ */
+class DartFixesRequestImpl implements DartFixesRequest {
+  @override
+  final ResourceProvider resourceProvider;
+
+  @override
+  final int offset;
+
+  @override
+  final List<AnalysisError> errorsToFix;
+
+  @override
+  final ResolveResult result;
+
+  /**
+   * Initialize a newly create request with the given data.
+   */
+  DartFixesRequestImpl(
+      this.resourceProvider, this.offset, this.errorsToFix, this.result);
+}
+
+/**
  * A concrete implementation of [FixCollector].
  */
 class FixCollectorImpl implements FixCollector {
   /**
    * The list of fixes that have been collected.
    */
   final Map<AnalysisError, List<PrioritizedSourceChange>> fixMap =
       <AnalysisError, List<PrioritizedSourceChange>>{};
 
   /**
    * Return the fixes that have been collected up to this point.
    */
   List<AnalysisErrorFixes> get fixes {
     List<AnalysisErrorFixes> fixes = <AnalysisErrorFixes>[];
     AnalyzerConverter converter = new AnalyzerConverter();
     for (AnalysisError error in fixMap.keys) {
       fixes.add(new AnalysisErrorFixes(converter.convertAnalysisError(error),
           fixes: fixMap[error]));
     }
     return fixes;
   }
 
   @override
   void addFix(AnalysisError error, PrioritizedSourceChange change) {
     fixMap.putIfAbsent(error, () => <PrioritizedSourceChange>[]).add(change);
   }
 }
-
-/**
- * A concrete implementation of [FixesRequest].
- */
-class FixesRequestImpl implements FixesRequest {
-  @override
-  AnalysisError error;
-
-  @override
-  final ResourceProvider resourceProvider;
-
-  @override
-  final int offset;
-
-  @override
-  final ResolveResult result;
-
-  /**
-   * Initialize a newly create request with the given data.
-   */
-  FixesRequestImpl(this.resourceProvider, this.offset, this.result);
-}