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diff --git a/deps/v8/src/heap/cppgc-js/cpp-heap.h b/deps/v8/src/heap/cppgc-js/cpp-heap.h
new file mode 100644
index 0000000000..0105934ac1
--- /dev/null
+++ b/deps/v8/src/heap/cppgc-js/cpp-heap.h
@@ -0,0 +1,43 @@
+// Copyright 2020 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_CPPGC_JS_CPP_HEAP_H_
+#define V8_HEAP_CPPGC_JS_CPP_HEAP_H_
+
+#include "include/v8.h"
+#include "src/base/macros.h"
+#include "src/heap/cppgc/heap-base.h"
+
+namespace v8 {
+
+class Isolate;
+
+namespace internal {
+
+// A C++ heap implementation used with V8 to implement unified heap.
+class V8_EXPORT_PRIVATE CppHeap final : public cppgc::internal::HeapBase,
+                                        public v8::EmbedderHeapTracer {
+ public:
+  CppHeap(v8::Isolate* isolate, size_t custom_spaces);
+
+  HeapBase& AsBase() { return *this; }
+  const HeapBase& AsBase() const { return *this; }
+
+  void RegisterV8References(
+      const std::vector<std::pair<void*, void*> >& embedder_fields) final;
+  void TracePrologue(TraceFlags flags) final;
+  bool AdvanceTracing(double deadline_in_ms) final;
+  bool IsTracingDone() final;
+  void TraceEpilogue(TraceSummary* trace_summary) final;
+  void EnterFinalPause(EmbedderStackState stack_state) final;
+
+ private:
+  Isolate& isolate_;
+  bool marking_done_ = false;
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_HEAP_CPPGC_JS_CPP_HEAP_H_