Track live instance and allocation counts for classes

runtime/vm/gc_marker.cc

Index: runtime/vm/gc_marker.cc
diff --git a/runtime/vm/gc_marker.cc b/runtime/vm/gc_marker.cc
index c5b5dc80cb069f8aada8a593c875f5d3c89bf201..504a8b5e419055a532de961974424d72041fb0cd 100644
--- a/runtime/vm/gc_marker.cc
+++ b/runtime/vm/gc_marker.cc
@@ -127,6 +127,7 @@ class MarkingVisitor : public ObjectPointerVisitor {
       : ObjectPointerVisitor(isolate),
         heap_(heap),
         vm_heap_(Dart::vm_isolate()->heap()),
+        class_table_(isolate->class_table()),
         page_space_(page_space),
         marking_stack_(marking_stack),
         visiting_old_object_(NULL) {
@@ -209,14 +210,16 @@ class MarkingVisitor : public ObjectPointerVisitor {
         visiting_old_object_->SetRememberedBit();
         isolate()->store_buffer()->AddObjectGC(visiting_old_object_);
       }
+      class_table_->ReportLiveNewSpace(raw_obj->GetClassId(), raw_obj->Size());
       return;
     }
-
+    class_table_->ReportLiveOldSpace(raw_obj->GetClassId(), raw_obj->Size());
     MarkAndPush(raw_obj);
   }
 
   Heap* heap_;
   Heap* vm_heap_;
+  ClassTable* class_table_;
   PageSpace* page_space_;
   MarkingStack* marking_stack_;
   RawObject* visiting_old_object_;