dartdoc supports isAbstract on methods

pkg/dartdoc/lib/src/mirrors/dart2js_mirror.dart

Index: pkg/dartdoc/lib/src/mirrors/dart2js_mirror.dart
diff --git a/pkg/dartdoc/lib/src/mirrors/dart2js_mirror.dart b/pkg/dartdoc/lib/src/mirrors/dart2js_mirror.dart
index 39b1aa168861979ea58fb2381f618a1782adae2b..27494e06a71d4f9c4e0e480a3fdaeeb9b6914de7 100644
--- a/pkg/dartdoc/lib/src/mirrors/dart2js_mirror.dart
+++ b/pkg/dartdoc/lib/src/mirrors/dart2js_mirror.dart
@@ -754,6 +754,9 @@ class Dart2JsInterfaceMirror extends Dart2JsObjectMirror
 
   bool get isInterface => _class.isInterface();
 
+  bool get isAbstract =>
+      _class.modifiers !== null && _class.modifiers.isAbstract();
+
   bool get isPrivate => _isPrivate(simpleName);
 
   bool get isDeclaration => true;
@@ -1022,6 +1025,8 @@ class Dart2JsInterfaceTypeMirror extends Dart2JsTypeElementMirror
 
   bool get isInterface => declaration.isInterface;
 
+  bool get isAbstract => declaration.isAbstract;
+
   bool get isPrivate => declaration.isPrivate;
 
   bool get isDeclaration => false;
@@ -1317,6 +1322,9 @@ class Dart2JsMethodMirror extends Dart2JsElementMirror
       system, _function.computeSignature(system.compiler).returnType,
       system.compiler.types.dynamicType);
 
+  bool get isAbstract =>
+      _function.modifiers !== null && _function.modifiers.isAbstract();
+
   bool get isConst => _kind == Dart2JsMethodKind.CONST;
 
   bool get isFactory => _kind == Dart2JsMethodKind.FACTORY;