Add file missed in last commit (TBR)

pkg/analyzer/lib/src/lint/options_rule_validator.dart

Index: pkg/analyzer/lib/src/lint/options_rule_validator.dart
diff --git a/pkg/analyzer/lib/src/lint/options_rule_validator.dart b/pkg/analyzer/lib/src/lint/options_rule_validator.dart
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index 0000000000000000000000000000000000000000..109cdd22c1d56fdfb394c4ca9ab49d91317552e7
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+++ b/pkg/analyzer/lib/src/lint/options_rule_validator.dart
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+// Copyright (c) 2016, 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/analyzer.dart';
+import 'package:analyzer/plugin/options.dart';
+import 'package:analyzer/src/lint/registry.dart';
+import 'package:yaml/yaml.dart';
+
+/**
+ * An error code indicating an undefined lint rule.
+ *
+ * Parameters:
+ * 0: the rule name
+ */
+const AnalysisOptionsWarningCode UNDEFINED_LINT_WARNING =
+    const AnalysisOptionsWarningCode(
+        'UNDEFINED_LINT_WARNING', "'{0}' is not a recognized lint rule");
+
+/**
+ * Validates `linter` rule configurations.
+ */
+class LinterRuleOptionsValidator extends OptionsValidator {
+  static const linter = 'linter';
+  static const rulesKey = 'rules';
+  @override
+  List<AnalysisError> validate(
+      ErrorReporter reporter, Map<String, YamlNode> options) {
+    List<AnalysisError> errors = <AnalysisError>[];
+    var node = options[linter];
+    if (node is YamlMap) {
+      var rules = node.nodes[rulesKey];
+      validateRules(rules, reporter);
+    }
+    return errors;
+  }
+
+  validateRules(dynamic rules, ErrorReporter reporter) {
+    if (rules is YamlList) {
+      Iterable<String> registeredLints =
+          Registry.ruleRegistry.map((r) => r.name);
+      rules.nodes.forEach((YamlNode ruleNode) {
+        Object value = ruleNode.value;
+        if (value != null && !registeredLints.contains(value)) {
+          reporter.reportErrorForSpan(
+              UNDEFINED_LINT_WARNING, ruleNode.span, [value]);
+        }
+      });
+    }
+  }
+}