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diff --git a/deps/v8/src/heap/cppgc/compactor.h b/deps/v8/src/heap/cppgc/compactor.h
new file mode 100644
index 0000000000..d354274a33
--- /dev/null
+++ b/deps/v8/src/heap/cppgc/compactor.h
@@ -0,0 +1,56 @@
+// 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_COMPACTOR_H_
+#define V8_HEAP_CPPGC_COMPACTOR_H_
+
+#include "src/heap/cppgc/compaction-worklists.h"
+#include "src/heap/cppgc/garbage-collector.h"
+#include "src/heap/cppgc/raw-heap.h"
+
+namespace cppgc {
+namespace internal {
+
+class V8_EXPORT_PRIVATE Compactor final {
+  using CompactableSpaceHandling =
+      Sweeper::SweepingConfig::CompactableSpaceHandling;
+
+ public:
+  explicit Compactor(RawHeap&);
+  ~Compactor() { DCHECK(!is_enabled_); }
+
+  void InitializeIfShouldCompact(GarbageCollector::Config::MarkingType,
+                                 GarbageCollector::Config::StackState);
+  // Returns true is compaction was cancelled.
+  bool CancelIfShouldNotCompact(GarbageCollector::Config::MarkingType,
+                                GarbageCollector::Config::StackState);
+  CompactableSpaceHandling CompactSpacesIfEnabled();
+
+  CompactionWorklists* compaction_worklists() {
+    return compaction_worklists_.get();
+  }
+
+  void EnableForNextGCForTesting() { enable_for_next_gc_for_testing_ = true; }
+
+  bool IsEnabledForTesting() const { return is_enabled_; }
+
+ private:
+  bool ShouldCompact(GarbageCollector::Config::MarkingType,
+                     GarbageCollector::Config::StackState);
+
+  RawHeap& heap_;
+  // Compactor does not own the compactable spaces. The heap owns all spaces.
+  std::vector<NormalPageSpace*> compactable_spaces_;
+
+  std::unique_ptr<CompactionWorklists> compaction_worklists_;
+
+  bool is_enabled_ = false;
+
+  bool enable_for_next_gc_for_testing_ = false;
+};
+
+}  // namespace internal
+}  // namespace cppgc
+
+#endif  // V8_HEAP_CPPGC_COMPACTOR_H_