Add a version of heap snapshots that use only fields and stack frames as roots and only include ins…

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

Index: runtime/observatory/lib/src/models/repositories/heap_snapshot.dart
diff --git a/runtime/observatory/lib/src/models/repositories/heap_snapshot.dart b/runtime/observatory/lib/src/models/repositories/heap_snapshot.dart
index da71fe97e60215f53a73069628d3292b0895b466..b6ce2b891b9c6cd71efb06ea3a9638f280d7d32d 100644
--- a/runtime/observatory/lib/src/models/repositories/heap_snapshot.dart
+++ b/runtime/observatory/lib/src/models/repositories/heap_snapshot.dart
@@ -31,5 +31,6 @@ abstract class HeapSnapshotLoadingProgress {
 
 abstract class HeapSnapshotRepository {
   Stream<HeapSnapshotLoadingProgressEvent> get(IsolateRef isolate,
-      {bool gc: false});
+                                               {String roots: 'VM',

[Cutch, 2016/11/18 20:40:31]

HeapSnapshotRoots roots: HeapSnapshotRoots.VM

[rmacnak, 2016/11/18 22:34:02]

Done. Here and elsewhere.

+                                                bool gc: false});
 }