Converted Observatory heap-snapshot element

runtime/observatory/lib/heap_snapshot.dart

Index: runtime/observatory/lib/heap_snapshot.dart
diff --git a/runtime/observatory/lib/allocation_profile.dart b/runtime/observatory/lib/heap_snapshot.dart
similarity index 69%
copy from runtime/observatory/lib/allocation_profile.dart
copy to runtime/observatory/lib/heap_snapshot.dart
index 80862768ff89f3e24a2b22af47a389d46a6b98ba..84bc390591890a559db7f8df9e820e88e185b518 100644
--- a/runtime/observatory/lib/allocation_profile.dart
+++ b/runtime/observatory/lib/heap_snapshot.dart
@@ -2,9 +2,11 @@
 // 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.
 
-library allocation_profiler;
+library heap_snapshot;
 
+import 'dart:async';
 import 'package:observatory/models.dart' as M;
+import 'package:observatory/object_graph.dart';
 import 'package:observatory/service.dart' as S;
 
-part 'src/allocation_profile/allocation_profile.dart';
+part 'src/heap_snapshot/heap_snapshot.dart';