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diff --git a/chromium/v8/src/heap/cppgc/heap-growing.h b/chromium/v8/src/heap/cppgc/heap-growing.h
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+++ b/chromium/v8/src/heap/cppgc/heap-growing.h
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+// 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_HEAP_GROWING_H_
+#define V8_HEAP_CPPGC_HEAP_GROWING_H_
+
+#include "include/cppgc/heap.h"
+#include "src/base/macros.h"
+#include "src/heap/cppgc/globals.h"
+#include "src/heap/cppgc/raw-heap.h"
+
+namespace cppgc {
+
+class Platform;
+
+namespace internal {
+
+class GarbageCollector;
+class StatsCollector;
+
+// Growing strategy that invokes garbage collection using GarbageCollector based
+// on allocation statistics provided by StatsCollector and ResourceConstraints.
+//
+// Implements a fixed-ratio growing strategy with an initial heap size that the
+// GC can ignore to avoid excessive GCs for smaller heaps.
+class V8_EXPORT_PRIVATE HeapGrowing final {
+ public:
+  // Constant growing factor for growing the heap limit.
+  static constexpr double kGrowingFactor = 1.5;
+  // For smaller heaps, allow allocating at least LAB in each regular space
+  // before triggering GC again.
+  static constexpr size_t kMinLimitIncrease =
+      kPageSize * RawHeap::kNumberOfRegularSpaces;
+
+  HeapGrowing(GarbageCollector*, StatsCollector*,
+              cppgc::Heap::ResourceConstraints);
+  ~HeapGrowing();
+
+  HeapGrowing(const HeapGrowing&) = delete;
+  HeapGrowing& operator=(const HeapGrowing&) = delete;
+
+  size_t limit() const;
+
+ private:
+  class HeapGrowingImpl;
+  std::unique_ptr<HeapGrowingImpl> impl_;
+};
+
+}  // namespace internal
+}  // namespace cppgc
+
+#endif  // V8_HEAP_CPPGC_HEAP_GROWING_H_