Support serialization of generic methods.

pkg/compiler/lib/src/serialization/element_serialization.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.elements;
 
 import '../common.dart';
 import '../common/names.dart';
 import '../constants/constructors.dart';
 import '../constants/expressions.dart';
@@ skipping 538 matching lines @@
     }
     SerializerUtil.serializeParentRelation(element, encoder);
     encoder.setBool(Key.IS_EXTERNAL, element.isExternal);
     encoder.setBool(Key.IS_ABSTRACT, element.isAbstract);
     encoder.setBool(Key.IS_INJECTED, element.isInjected);
     if (element.isLocal) {
       LocalFunctionElement localFunction = element;
       encoder.setElement(
           Key.EXECUTABLE_CONTEXT, localFunction.executableContext);
     }
+    encoder.setTypes(Key.TYPE_VARIABLES, element.typeVariables);
   }
 }
 
 class TypedefSerializer implements ElementSerializer {
   const TypedefSerializer();
 
   SerializedElementKind getSerializedKind(Element element) {
     if (element.isTypedef) {
       return SerializedElementKind.TYPEDEF;
     }
@@ skipping 274 matching lines @@
         return new LocalVariableElementZ(decoder);
       case SerializedElementKind.EXTERNAL_LIBRARY:
       case SerializedElementKind.EXTERNAL_LIBRARY_MEMBER:
       case SerializedElementKind.EXTERNAL_CLASS_MEMBER:
       case SerializedElementKind.EXTERNAL_CONSTRUCTOR:
         break;
     }
     throw new UnsupportedError("Unexpected element kind '${elementKind}.");
   }
 }