Merged from GC branch to bleeding_edge

src/incremental-marking-inl.h

Index: src/incremental-marking-inl.h
diff --git a/src/incremental-marking-inl.h b/src/incremental-marking-inl.h
index b1b29ecbf0a522f4e533538004df1b49174a5fbd..43fe0f55390f69a0ef218340ffac8e0100bfedff 100644
--- a/src/incremental-marking-inl.h
+++ b/src/incremental-marking-inl.h
@@ -114,8 +114,10 @@ void IncrementalMarking::BlackToGreyAndUnshift(HeapObject* obj,
   ASSERT(obj->Size() >= 2*kPointerSize);
   ASSERT(IsMarking());
   Marking::BlackToGrey(mark_bit);
+  int obj_size = obj->Size();
+  MemoryChunk::IncrementLiveBytes(obj->address(), -obj_size);
   int64_t old_bytes_rescanned = bytes_rescanned_;
-  bytes_rescanned_ = old_bytes_rescanned + obj->Size();
+  bytes_rescanned_ = old_bytes_rescanned + obj_size;
   if ((bytes_rescanned_ >> 20) != (old_bytes_rescanned >> 20)) {
     if (bytes_rescanned_ > 2 * heap_->PromotedSpaceSize()) {
       // If we have queued twice the heap size for rescanning then we are