fix #28008, fix #28009 implement FutureOr<T>

pkg/dev_compiler/lib/src/compiler/code_generator.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.
 
 import 'dart:collection' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 1156 matching lines @@
     var classExpr = new JS.ClassExpression(new JS.Identifier(type.name),
         _emitClassHeritage(element), [constructor, toStringF]);
     var id = _emitTopLevelName(element);
 
     // Emit metadata for synthetic enum index member.
     // TODO(jacobr): make field readonly when that is supported.
     var tInstanceFields = <JS.Property>[
       new JS.Property(
           _emitMemberName('index'), _emitAnnotatedType(intClass.type, null))
     ];
-    var sigFields = <JS.Property>[_buildSignatureField('fields', tInstanceFields)];
+    var sigFields = <JS.Property>[
+      _buildSignatureField('fields', tInstanceFields)
+    ];
     var sig = new JS.ObjectInitializer(sigFields);
 
     var result = [
       js.statement('# = #', [id, classExpr]),
       _callHelperStatement('setSignature(#, #);', [id, sig])
     ];
 
     // defineEnumValues internally depends on dart.constList which uses
     // _interceptors.JSArray.
     _declareBeforeUse(_jsArray);
@@ skipping 589 matching lines @@
         methodNames.add(_declareMemberName(e, useExtension: false));
       }
       body.add(_callHelperStatement('defineExtensionMembers(#, #);', [
         className,
         new JS.ArrayInitializer(methodNames, multiline: methodNames.length > 4)
       ]));
     }
   }
 
   JS.Property _buildSignatureField(String name, List<JS.Property> elements) {
-    var o =
-        new JS.ObjectInitializer(elements, multiline: elements.length > 1);
+    var o = new JS.ObjectInitializer(elements, multiline: elements.length > 1);
     // TODO(vsm): Remove
     var e = js.call('() => #', o);
     return new JS.Property(_propertyName(name), e);
   }
 
   /// Emit the signature on the class recording the runtime type information
   void _emitClassSignature(
       List<MethodDeclaration> methods,
       List<FieldDeclaration> fields,
       ClassElement classElem,
@@ skipping 4068 matching lines @@
   if (targetIdentifier.staticElement is! PrefixElement) return false;
   var prefix = targetIdentifier.staticElement as PrefixElement;
 
   // The library the prefix is referring to must come from a deferred import.
   var containingLibrary = resolutionMap
       .elementDeclaredByCompilationUnit(target.root as CompilationUnit)
       .library;
   var imports = containingLibrary.getImportsWithPrefix(prefix);
   return imports.length == 1 && imports[0].isDeferred;
 }