[heap] Unconditionally mark objects that undergo unsafe layout changes.

src/heap/heap.cc

 // 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.
 
 #include "src/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/context-slot-cache.h"
 #include "src/base/bits.h"
@@ skipping 4283 matching lines @@
           }
           addr += obj->Size();
         }
       }
     }
   }
 }
 
 void Heap::NotifyObjectLayoutChange(HeapObject* object,
                                     const DisallowHeapAllocation&) {
-// TODO(ulan): Add synchronization with the concurrent marker.
+  if (FLAG_incremental_marking && incremental_marking()->IsMarking()) {
+    incremental_marking()->MarkGrey(this, object);
+  }
 #ifdef VERIFY_HEAP
   DCHECK(pending_layout_change_object_ == nullptr);
   pending_layout_change_object_ = object;
 #endif
 }
 
 #ifdef VERIFY_HEAP
 void Heap::VerifyObjectLayoutChange(HeapObject* object, Map* new_map) {
   if (pending_layout_change_object_ == nullptr) {
     DCHECK(!object->IsJSObject() ||
@@ skipping 2081 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8