Option support for `enableGenericMethods`.

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

Index: pkg/analyzer/lib/src/task/options.dart
diff --git a/pkg/analyzer/lib/src/task/options.dart b/pkg/analyzer/lib/src/task/options.dart
index 689bff2eebbd5b212bf0decb42562883051f97a4..5b968b075a2deb439b2031dc71a86b01981665ee 100644
--- a/pkg/analyzer/lib/src/task/options.dart
+++ b/pkg/analyzer/lib/src/task/options.dart
@@ -35,6 +35,7 @@ void configureContextOptions(
 /// `analyzer` analysis options constants.
 class AnalyzerOptions {
   static const String analyzer = 'analyzer';
+  static const String enableGenericMethods = 'enableGenericMethods';
   static const String enableSuperMixins = 'enableSuperMixins';
   static const String errors = 'errors';
   static const String exclude = 'exclude';
@@ -61,7 +62,10 @@ class AnalyzerOptions {
   ];
 
   /// Supported `analyzer` language configuration options.
-  static const List<String> languageOptions = const [enableSuperMixins];
+  static const List<String> languageOptions = const [
+    enableGenericMethods,
+    enableSuperMixins
+  ];
 }
 
 /// Validates `analyzer` options.
@@ -391,11 +395,19 @@ class _OptionsProcessor {
           if (feature == AnalyzerOptions.enableSuperMixins) {
             if (isTrue(v.value)) {
               AnalysisOptionsImpl options =
-                  new AnalysisOptionsImpl.from(context.analysisOptions);
+              new AnalysisOptionsImpl.from(context.analysisOptions);
               options.enableSuperMixins = true;
               context.analysisOptions = options;
             }
           }
+          if (feature == AnalyzerOptions.enableGenericMethods) {
+            if (isTrue(v.value)) {
+              AnalysisOptionsImpl options =
+              new AnalysisOptionsImpl.from(context.analysisOptions);
+              options.enableGenericMethods = true;
+              context.analysisOptions = options;
+            }
+          }
         }
       });
     }