Updates incremental marking pass to collect object statistics.

src/heap/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 2218 matching lines @@
   friend class AlwaysAllocateScope;
   friend class GCCallbacksScope;
   friend class GCTracer;
   friend class HeapIterator;
   friend class IdleScavengeObserver;
   friend class IncrementalMarking;
   friend class IteratePromotedObjectsVisitor;
   friend class MarkCompactCollector;
   friend class MarkCompactMarkingVisitor;
   friend class NewSpace;
-  friend class ObjectStatsVisitor;
+  friend class ObjectStatsCollector;
   friend class Page;
   friend class Scavenger;
   friend class StoreBuffer;
   friend class TestMemoryAllocatorScope;
 
   // The allocator interface.
   friend class Factory;
 
   // The Isolate constructs us.
   friend class Isolate;
@@ skipping 394 matching lines @@
   friend class LargeObjectSpace;
   friend class NewSpace;
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_