Converted Observatory refs elements

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

Index: runtime/observatory/lib/src/models/objects/object.dart
diff --git a/runtime/observatory/lib/src/models/objects/object.dart b/runtime/observatory/lib/src/models/objects/object.dart
index 829a60d2880250a4802b7ea7620cf8a3a085c577..7679c5d58c0b3b0e68195d0832fa33c7ad0fd476 100644
--- a/runtime/observatory/lib/src/models/objects/object.dart
+++ b/runtime/observatory/lib/src/models/objects/object.dart
@@ -9,4 +9,23 @@ abstract class ObjectRef {
   String get id;
 }
 
-abstract class Object implements ObjectRef {}
+abstract class Object implements ObjectRef {
+  /// [optional] If an object is allocated in the Dart heap, it will have
+  /// a corresponding class object.
+  ///
+  /// The class of a non-instance is not a Dart class, but is instead
+  /// an internal vm object.
+  ///
+  /// Moving an Object into or out of the heap is considered a
+  /// backwards compatible change for types other than Instance.
+  ClassRef get clazz;
+
+  /// [optional] The size of this object in the heap.
+  ///
+  /// If an object is not heap-allocated, then this field is omitted.
+  ///
+  /// Note that the size can be zero for some objects. In the current
+  /// VM implementation, this occurs for small integers, which are
+  /// stored entirely within their object pointers.
+  int get size;
+}