Added ability to request zone memory information for all isolates through the VM service and added …

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

Index: runtime/observatory/lib/src/models/objects/thread.dart
diff --git a/runtime/observatory/lib/src/models/objects/thread.dart b/runtime/observatory/lib/src/models/objects/thread.dart
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+++ b/runtime/observatory/lib/src/models/objects/thread.dart
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+// 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;
+
+enum ThreadKind {
+  kUnknownTask,
+  kMutatorTask,
+  kCompilerTask,
+  kSweeperTask,
+  kMarkerTask,
+  kFinalizerTask
+}
+
+abstract class Thread {
+  /// The id associated with the thread on creation
+  String get id;
+
+  /// The task type associated with the thread,
+  ThreadKind get kind;
+
+  /// A list of all the zones held by the thread.
+  Iterable<Zone> get zones;
+}