Add LibraryMirror.declarations and ClassMirror.declarations to the API and both implementations.

tests/lib/mirrors/stringify.dart

 // Copyright (c) 2013, 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.
 
 /// Helper methods for converting a [Mirror] to a [String].
 library test.stringify;
 
 import 'dart:mirrors';
 
 import 'package:expect/expect.dart';
@@ skipping 87 matching lines @@
 
 stringifyClass(ClassMirror cls) {
   var buffer = new StringBuffer();
   writeDeclarationOn(cls, buffer);
   return 'Class($buffer)';
 }
 
 stringifyMethod(MethodMirror method) {
   var buffer = new StringBuffer();
   writeDeclarationOn(method, buffer);
+  if (method.isAbstract) buffer.write(', abstract');
   if (method.isStatic) buffer.write(', static');
   if (method.isGetter) buffer.write(', getter');
   if (method.isSetter) buffer.write(', setter');
   if (method.isConstructor) buffer.write(', constructor');
   return 'Method($buffer)';
 }
 
 stringify(value) {
   if (value is Map) return stringifyMap(value);
   if (value is Iterable) return stringifyIterable(value);
@@ skipping 15 matching lines @@
   Expect.stringEquals(expected, stringify(actual), reason);
 }
 
 compareSymbols(Symbol a, Symbol b) {
   return MirrorSystem.getName(a).compareTo(MirrorSystem.getName(b));
 }
 
 simpleNames(Iterable<Mirror> i) => i.map((e) => e.simpleName);
 
 sort(Iterable<Symbol> symbols) => symbols.toList()..sort(compareSymbols);