Hide internal classes from Memory Profile

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

Index: runtime/observatory/lib/src/models/objects/allocation_profile.dart
diff --git a/runtime/observatory/lib/src/models/objects/allocation_profile.dart b/runtime/observatory/lib/src/models/objects/allocation_profile.dart
index 6a60a624a09697c6763b7c90dc072f9406b7e21e..4f113a69dad5ead6deff55cdf4480d2a0dc28957 100644
--- a/runtime/observatory/lib/src/models/objects/allocation_profile.dart
+++ b/runtime/observatory/lib/src/models/objects/allocation_profile.dart
@@ -13,7 +13,11 @@ abstract class AllocationProfile {
 }
 
 abstract class ClassHeapStats {
+  /// [Optional] at least one between clazz and displayName should be non null
   ClassRef get clazz;
+
+  /// [Optional] at least one between clazz and displayName should be non null
+  String get displayName;
   Allocations get newSpace;
   Allocations get oldSpace;
   int get promotedInstances;