Converted Observatory refs elements

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

Index: runtime/observatory/lib/src/models/objects/context.dart
diff --git a/runtime/observatory/lib/src/models/objects/context.dart b/runtime/observatory/lib/src/models/objects/context.dart
new file mode 100644
index 0000000000000000000000000000000000000000..46d0a122689a7ae4dd763e15aefc72859ad8d49f
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+++ b/runtime/observatory/lib/src/models/objects/context.dart
@@ -0,0 +1,18 @@
+// 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 ContextRef extends ObjectRef {
+  /// The number of variables in this context.
+  int get length;
+}
+
+abstract class Context extends Object implements ContextRef {
+  /// [optional] The enclosing context for this context.
+  Context get parentContext;
+
+  // The variables in this context object.
+  //Iterable<ContextElement> get variables;
+}