Adds support for remaining generic method syntax constructs.

pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart

 // Copyright (c) 2014, 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 dart_tree_printer;
 
 import '../common.dart';
 import '../constants/values.dart' as values;
 import '../dart_types.dart' as types;
 import '../elements/elements.dart' as elements;
@@ skipping 1088 matching lines @@
     } else {
       List<tree.Node> typeVariableList = <tree.Node>[];
       for (types.TypeVariableType typeVariable in typeVariables) {
         tree.Node id = makeIdentifier(typeVariable.name);
         treeElements[id] = typeVariable.element;
         tree.Node bound;
         if (!typeVariable.element.bound.isObject) {
           bound =
               makeType(TypeGenerator.createType(typeVariable.element.bound));
         }
-        tree.TypeVariable node = new tree.TypeVariable(id, bound);
+        tree.TypeVariable node = new tree.TypeVariable(id, extendsToken, bound);
         treeElements.setType(node, typeVariable);
         typeVariableList.add(node);
       }
       return makeList(',', typeVariableList, open: lt, close: gt);
     }
   }
 
   /// Create a [tree.NodeList] containing the declared interfaces.
   ///
   /// [interfaces] is from [elements.ClassElement] in reverse declaration order
@@ skipping 212 matching lines @@
       if (chunk.previous != null) {
         return new tree.StringJuxtaposition(
             printStringChunk(chunk.previous), node);
       } else {
         return node;
       }
     }
     return printStringChunk(output.chunk);
   }
 }