Implement @patch annotation for patch class members

runtime/lib/math_patch.dart

 // Copyright (c) 2012, 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:typed_data";
 
 // A VM patch of the dart:math library.
 
 // If [x] is an [int] and [exponent] is a non-negative [int], the result is
 // an [int], otherwise the result is a [double].
@@ skipping 64 matching lines @@
 double _asin(double x) native "Math_asin";
 double _atan(double x) native "Math_atan";
 double _sqrt(double x) native "Math_sqrt";
 double _exp(double x) native "Math_exp";
 double _log(double x) native "Math_log";
 
 
 // TODO(iposva): Handle patch methods within a patch class correctly.
 @patch class Random {
 
-  /*@patch*/ factory Random([int seed]) {
+  @patch factory Random([int seed]) {
     var state = _Random._setupSeed((seed == null) ? _Random._nextSeed() : seed);
     // Crank a couple of times to distribute the seed bits a bit further.
     return new _Random._withState(state).._nextState()
                                         .._nextState()
                                         .._nextState()
                                         .._nextState();
   }
 
-  /*@patch*/ factory Random.secure() {
+  @patch factory Random.secure() {
     return new _SecureRandom();
   }
 }
 
 
 class _Random implements Random {
   // Internal state of the random number generator.
   final _state;
   static const _kSTATE_LO = 0;
   static const _kSTATE_HI = 1;  // Unused in Dart code.
@@ skipping 100 matching lines @@
 
   bool nextBool() {
     return _getBytes(1).isEven;
   }
 
   // Constants used by the algorithm.
   static const _POW2_32 = 1 << 32;
   static const _POW2_53_D = 1.0 * (1 << 53);
 }