First step of support for parsing and ignoring generic methods.

pkg/compiler/lib/src/parser/element_listener.dart

Index: pkg/compiler/lib/src/parser/element_listener.dart
diff --git a/pkg/compiler/lib/src/parser/element_listener.dart b/pkg/compiler/lib/src/parser/element_listener.dart
index 48bfae3139327643294a3ba0855a560138244dde..7b1f18837e309aa449d8c20a47a01ebb52ea5f5d 100644
--- a/pkg/compiler/lib/src/parser/element_listener.dart
+++ b/pkg/compiler/lib/src/parser/element_listener.dart
@@ -64,6 +64,19 @@ class ScannerOptions {
   const ScannerOptions({this.canUseNative: false});
 }
 
+/// Options used for parsing.
+///
+/// Use this to conditionally support certain constructs, e.g.,
+/// experimental ones.
+class ParserOptions {
+  final bool enableConditionalDirectives;
+  final bool enableGenericMethods;
+
+  const ParserOptions(
+      {this.enableConditionalDirectives: false,
+       this.enableGenericMethods: false});
+}
+
 /**
  * A parser event listener designed to work with [PartialParser]. It
  * builds elements representing the top-level declarations found in