Support serialization of generic methods.

pkg/compiler/lib/src/serialization/keys.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 dart2js.serialization.keys;
 
 /// Keys used for serialization.
 class Key {
   static const Key ALIAS = const Key('alias');
   static const Key ARGUMENTS = const Key('arguments');
@@ skipping 43 matching lines @@
   static const Key INDEX = const Key('index');
   static const Key IS_ABSTRACT = const Key('isAbstract');
   static const Key IS_BREAK_TARGET = const Key('isBreakTarget');
   static const Key IS_CONST = const Key('isConst');
   static const Key IS_CONTINUE_TARGET = const Key('isContinueTarget');
   static const Key IS_DEFERRED = const Key('isDeferred');
   static const Key IS_EMPTY = const Key('isEmpty');
   static const Key IS_EXTERNAL = const Key('isExternal');
   static const Key IS_FINAL = const Key('isFinal');
   static const Key IS_INJECTED = const Key('isInjected');
+  static const Key IS_METHOD_TYPE_VARIABLE_TYPE =
+      const Key('isMethodTypeVariableType');
   static const Key IS_NAMED = const Key('isNamed');
   static const Key IS_OPERATOR = const Key('isOperator');
   static const Key IS_OPTIONAL = const Key('isOptional');
   static const Key IS_PROXY = const Key('isProxy');
   static const Key IS_REDIRECTING = const Key('isRedirecting');
   static const Key IS_SETTER = const Key('isSetter');
   static const Key IS_UNNAMED_MIXIN_APPLICATION =
       const Key('isUnnamedMixinApplication');
   static const Key JUMP_TARGET = const Key('jumpTarget');
   static const Key JUMP_TARGETS = const Key('jumpTargets');
@@ skipping 54 matching lines @@
   static const Key URI = const Key('uri');
   static const Key VALUE = const Key('value');
   static const Key VALUES = const Key('values');
 
   final String name;
 
   const Key(this.name);
 
   String toString() => name;
 }