[Fuchsia] Give VMOs names

runtime/vm/heap.cc

Index: runtime/vm/heap.cc
diff --git a/runtime/vm/heap.cc b/runtime/vm/heap.cc
index 4998b881cfdc1c4876e1cbf79b991a4853aaa9c1..b6680ef0535af762ef2bbaddf1e9baafac068b04 100644
--- a/runtime/vm/heap.cc
+++ b/runtime/vm/heap.cc
@@ -520,6 +520,16 @@ void Heap::Init(Isolate* isolate,
 }
 
 
+void Heap::RegionName(Space space, char* name, intptr_t name_size) {
+  const char* isolate_name = isolate()->debugger_name() == NULL
+                           ? "<unknown>"
+                           : isolate()->debugger_name();
+  const char* space_name = (space == kNew) ? "newspace" : "oldspace";
+  const char* type_name = (space == kCode) ? "code" : "data";
+  OS::SNPrint(name, name_size, "%s %s %s", isolate_name, space_name, type_name);
+}
+
+
 void Heap::AddRegionsToObjectSet(ObjectSet* set) const {
   new_space_.AddRegionsToObjectSet(set);
   old_space_.AddRegionsToObjectSet(set);