Resubmission of native memory allocation info surfacing in Observatory. Fixed crashing tests and st…

runtime/observatory/lib/src/models/repositories/sample_profile.dart

 // 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 SampleProfileTag { userVM, userOnly, vmUser, vmOnly, none }
 
 enum SampleProfileLoadingStatus { disabled, fetching, loading, loaded }
 
+enum SampleProfileType { cpu, memory }
+
 bool isSampleProcessRunning(SampleProfileLoadingStatus status) {
   switch (status) {
     case SampleProfileLoadingStatus.fetching:
     case SampleProfileLoadingStatus.loading:
       return true;
     default:
       return false;
   }
 }
 
@@ skipping 14 matching lines @@
       IsolateRef isolate, ClassRef cls, SampleProfileTag tag);
   Future enable(IsolateRef isolate, ClassRef cls);
   Future disable(IsolateRef isolate, ClassRef cls);
 }
 
 abstract class IsolateSampleProfileRepository {
   Stream<SampleProfileLoadingProgressEvent> get(
       IsolateRef isolate, SampleProfileTag tag,
       {bool clear: false, bool forceFetch: false});
 }
+
+abstract class NativeMemorySampleProfileRepository {
+  Stream<SampleProfileLoadingProgressEvent> get(VM vm, SampleProfileTag tag,
+      {bool clear: false, bool forceFetch: false});
+}