- Implement hashCode and == for Capability.

runtime/lib/isolate_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:collection" show HashMap;
 
 patch class ReceivePort {
   /* patch */ factory ReceivePort() = _ReceivePortImpl;
 
   /* patch */ factory ReceivePort.fromRawReceivePort(RawReceivePort rawPort) =
       _ReceivePortImpl.fromRawReceivePort;
 }
 
 patch class Capability {
   /* patch */ factory Capability() = _CapabilityImpl;
 }
 
 class _CapabilityImpl implements Capability {
   factory _CapabilityImpl() native "CapabilityImpl_factory";
+
+  bool operator==(var other) {
+    return (other is _CapabilityImpl) && _equals(other);
+  }
+
+  int get hashCode {
+    return _get_hashcode();
+  }
+
+  _equals(other) native "CapabilityImpl_equals";
+  _get_hashcode() native "CapabilityImpl_get_hashcode";
 }
 
 patch class RawReceivePort {
   /**
    * Opens a long-lived port for receiving messages.
    *
    * A [RawReceivePort] is low level and does not work with [Zone]s. It
    * can not be paused. The data-handler must be set before the first
    * event is received.
    */
@@ skipping 332 matching lines @@
   }
 
   /* patch */ void addErrorListener(SendPort port) {
     throw new UnsupportedError("addErrorListener");
   }
 
   /* patch */ void removeErrorListener(SendPort port) {
     throw new UnsupportedError("removeErrorListener");
   }
 }