keep mixin and interface implementation info at runtime

lib/runtime/dart/_isolate_helper.js

Index: lib/runtime/dart/_isolate_helper.js
diff --git a/lib/runtime/dart/_isolate_helper.js b/lib/runtime/dart/_isolate_helper.js
index 303ea956b163f8f8c24a352a53c5bb0f3ea0197c..67143cb7824b9f5a4ba58566ab2b80b638be9a5c 100644
--- a/lib/runtime/dart/_isolate_helper.js
+++ b/lib/runtime/dart/_isolate_helper.js
@@ -729,6 +729,7 @@ var _isolate_helper;
       this[_updateGlobalState]();
     }
   }
+  _IsolateContext[dart.implements] = [_foreign_helper.IsolateContext];
   let _runHelper = Symbol('_runHelper');
   class _EventLoop extends core.Object {
     _EventLoop() {
@@ -1124,6 +1125,7 @@ var _isolate_helper;
       }
     }
   }
+  _BaseSendPort[dart.implements] = [isolate.SendPort];
   let _isClosed = Symbol('_isClosed');
   class _NativeJsSendPort extends _BaseSendPort {
     _NativeJsSendPort(receivePort$, isolateId) {
@@ -1154,6 +1156,7 @@ var _isolate_helper;
       return this[_receivePort][_id];
     }
   }
+  _NativeJsSendPort[dart.implements] = [isolate.SendPort];
   class _WorkerSendPort extends _BaseSendPort {
     _WorkerSendPort(workerId$, isolateId, receivePortId$) {
       this[_workerId] = workerId$;
@@ -1178,6 +1181,7 @@ var _isolate_helper;
       return dart.notNull(this[_workerId]) << 16 ^ dart.notNull(this[_isolateId]) << 8 ^ dart.notNull(this[_receivePortId]);
     }
   }
+  _WorkerSendPort[dart.implements] = [isolate.SendPort];
   let _handler = Symbol('_handler');
   let _nextFreeId = Symbol('_nextFreeId');
   let _close = Symbol('_close');
@@ -1223,6 +1227,7 @@ var _isolate_helper;
       return new _NativeJsSendPort(this, exports._globalState.currentContext.id);
     }
   }
+  RawReceivePortImpl[dart.implements] = [isolate.RawReceivePort];
   dart.defineNamedConstructor(RawReceivePortImpl, 'weak');
   dart.defineNamedConstructor(RawReceivePortImpl, _controlPort);
   RawReceivePortImpl._nextFreeId = 1;
@@ -1256,6 +1261,7 @@ var _isolate_helper;
       return this[_rawPort].sendPort;
     }
   }
+  ReceivePortImpl[dart.implements] = [isolate.ReceivePort];
   dart.defineNamedConstructor(ReceivePortImpl, 'weak');
   dart.defineNamedConstructor(ReceivePortImpl, 'fromRawReceivePort');
   let _once = Symbol('_once');
@@ -1324,6 +1330,7 @@ var _isolate_helper;
       return this[_handle] !== null;
     }
   }
+  TimerImpl[dart.implements] = [async.Timer];
   dart.defineNamedConstructor(TimerImpl, 'periodic');
   // Function hasTimer: () → bool
   function hasTimer() {
@@ -1358,6 +1365,7 @@ var _isolate_helper;
       return false;
     }
   }
+  CapabilityImpl[dart.implements] = [isolate.Capability];
   dart.defineNamedConstructor(CapabilityImpl, _internal);
   // Exports:
   exports.enterJsAsync = enterJsAsync;