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diff --git a/deps/v8/src/heap/combined-heap.h b/deps/v8/src/heap/combined-heap.h
new file mode 100644
index 0000000000..c331d95c3d
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+++ b/deps/v8/src/heap/combined-heap.h
@@ -0,0 +1,41 @@
+// Copyright 2019 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_COMBINED_HEAP_H_
+#define V8_HEAP_COMBINED_HEAP_H_
+
+#include "src/heap/heap.h"
+#include "src/heap/read-only-heap.h"
+#include "src/objects/objects.h"
+
+namespace v8 {
+namespace internal {
+
+// This class allows iteration over the entire heap (Heap and ReadOnlyHeap). It
+// uses the HeapIterator to iterate over non-read-only objects and accepts the
+// same filtering option. (Interrupting iteration while filtering unreachable
+// objects is still forbidden)
+class V8_EXPORT_PRIVATE CombinedHeapIterator final {
+ public:
+  CombinedHeapIterator(Heap* heap,
+                       HeapIterator::HeapObjectsFiltering filtering =
+                           HeapIterator::HeapObjectsFiltering::kNoFiltering)
+      : heap_iterator_(heap, filtering),
+        ro_heap_iterator_(heap->read_only_heap()) {}
+  HeapObject Next();
+
+ private:
+  HeapIterator heap_iterator_;
+  ReadOnlyHeapIterator ro_heap_iterator_;
+};
+
+V8_WARN_UNUSED_RESULT inline bool IsValidHeapObject(Heap* heap,
+                                                    HeapObject object) {
+  return ReadOnlyHeap::Contains(object) || heap->Contains(object);
+}
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_HEAP_COMBINED_HEAP_H_