Break up another large file

pkg/analyzer/lib/src/task/options.dart

 // Copyright (c) 2015, 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.src.task.options;
 
 import 'dart:collection';
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/plugin/options.dart';
@@ skipping 11 matching lines @@
 import 'package:source_span/source_span.dart';
 import 'package:yaml/yaml.dart';
 
 /// The errors produced while parsing an analysis options file.
 ///
 /// The list will be empty if there were no errors, but will not be `null`.
 final ListResultDescriptor<AnalysisError> ANALYSIS_OPTIONS_ERRORS =
     new ListResultDescriptor<AnalysisError>(
         'ANALYSIS_OPTIONS_ERRORS', AnalysisError.NO_ERRORS);
 
+/**
+ * The descriptor used to associate error processors with analysis contexts in
+ * configuration data.
+ */
+final ListResultDescriptor<ErrorProcessor> CONFIGURED_ERROR_PROCESSORS =
+    new ListResultDescriptor<ErrorProcessor>(
+        'configured.errors', const <ErrorProcessor>[]);
+
 final _OptionsProcessor _processor = new _OptionsProcessor();
 
 void applyToAnalysisOptions(
     AnalysisOptionsImpl options, Map<String, Object> optionMap) {
   _processor.applyToAnalysisOptions(options, optionMap);
 }
 
 /// Configure this [context] based on configuration details specified in
 /// the given [options].  If [options] is `null`, default values are applied.
 void configureContextOptions(
@@ skipping 572 matching lines @@
         }
       });
     } else if (config is Map) {
       options.strongMode = true;
       config.forEach((k, v) => _applyStrongModeOption(options, k, v));
     } else {
       options.strongMode = config is bool ? config : false;
     }
   }
 }