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

runtime/vm/service.h

Index: runtime/vm/service.h
diff --git a/runtime/vm/service.h b/runtime/vm/service.h
index a47fdbe40b90d4f12a6b838686ffeae5e486b89c..8ee0c0070777c2e82c234c403969fbb9dcd5e88b 100644
--- a/runtime/vm/service.h
+++ b/runtime/vm/service.h
@@ -8,6 +8,7 @@
 #include "include/dart_tools_api.h"
 
 #include "vm/allocation.h"
+#include "vm/object_graph.h"
 #include "vm/object_id_ring.h"
 #include "vm/os_thread.h"
 
@@ -107,7 +108,9 @@ class Service : public AllStatic {
       Dart_GetVMServiceAssetsArchive get_service_assets);
 
   static void SendEchoEvent(Isolate* isolate, const char* text);
-  static void SendGraphEvent(Thread* thread, bool collect_garbage);
+  static void SendGraphEvent(Thread* thread,
+                             ObjectGraph::SnapshotRoots roots,
+                             bool collect_garbage);
   static void SendInspectEvent(Isolate* isolate, const Object& inspectee);
 
   static void SendEmbedderEvent(Isolate* isolate,