Observatory:

runtime/observatory/lib/src/models/objects/isolate.dart

 // Copyright (c) 2016, 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.
 
 part of models;
 
 abstract class IsolateRef {
   /// The id which is passed to the getIsolate RPC to reload this
   /// isolate.
   String get id;
 
   /// A numeric id for this isolate, represented as a string. Unique.
   int get number;
 
   /// A name identifying this isolate. Not guaranteed to be unique.
   String get name;
+
+  /// Trigger a full GC, collecting all unreachable or weakly reachable objects.
+  Future collectAllGarbage();
 }
 
 enum IsolateStatus { loading, idle, running, paused }
 
 abstract class Isolate extends IsolateRef {
   /// The time that the VM started in milliseconds since the epoch.
   DateTime get startTime;
 
   /// Is the isolate in a runnable state?
   bool get runnable;
@@ skipping 47 matching lines @@
 
   Map get counters;
   HeapSpace get newSpace;
   HeapSpace get oldSpace;
 
   IsolateStatus get status;
 
   /// [optional]
   FunctionRef get entry;
 }