Implement a heap profiler for the Dart managed heap.

runtime/vm/pages.h

Index: runtime/vm/pages.h
diff --git a/runtime/vm/pages.h b/runtime/vm/pages.h
index afe418ab102f9bf00f2317a53f464c65736fd764..bd084d4feca21543f4bf46cfd63ae9160f6dc02f 100644
--- a/runtime/vm/pages.h
+++ b/runtime/vm/pages.h
@@ -52,6 +52,7 @@ class HeapPage {
     return result;
   }
 
+  void VisitObjects(ObjectVisitor* visitor) const;
   void VisitObjectPointers(ObjectPointerVisitor* visitor) const;
 
   RawObject* FindObject(FindObjectVisitor* visitor) const;
@@ -167,6 +168,7 @@ class PageSpace {
     return size <= kAllocatablePageSize;
   }
 
+  void VisitObjects(ObjectVisitor* visitor) const;
   void VisitObjectPointers(ObjectPointerVisitor* visitor) const;
 
   RawObject* FindObject(FindObjectVisitor* visitor) const;