1 files changed, 45 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/platform/heap/collection_support/heap_hash_set.h b/chromium/third_party/blink/renderer/platform/heap/collection_support/heap_hash_set.h
new file mode 100644
index 00000000000..47b58a73115
--- /dev/null
+++ b/chromium/third_party/blink/renderer/platform/heap/collection_support/heap_hash_set.h
@@ -0,0 +1,45 @@
+// Copyright 2021 The Chromium 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_COLLECTION_SUPPORT_HEAP_HASH_SET_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_COLLECTION_SUPPORT_HEAP_HASH_SET_H_
+
+#include "third_party/blink/renderer/platform/heap/heap.h"
+#include "third_party/blink/renderer/platform/heap/heap_allocator_impl.h"
+#include "third_party/blink/renderer/platform/heap/visitor.h"
+#include "third_party/blink/renderer/platform/wtf/hash_set.h"
+
+namespace blink {
+
+template <typename ValueArg,
+          typename HashArg = typename DefaultHash<ValueArg>::Hash,
+          typename TraitsArg = HashTraits<ValueArg>>
+class HeapHashSet final
+    : public GarbageCollected<HeapHashSet<ValueArg, HashArg, TraitsArg>>,
+      public HashSet<ValueArg, HashArg, TraitsArg, HeapAllocator> {
+  DISALLOW_NEW();
+
+ public:
+  HeapHashSet() = default;
+
+  void Trace(Visitor* visitor) const {
+    CheckType();
+    HashSet<ValueArg, HashArg, TraitsArg, HeapAllocator>::Trace(visitor);
+  }
+
+ private:
+  static constexpr void CheckType() {
+    static_assert(WTF::IsMemberOrWeakMemberType<ValueArg>::value,
+                  "HeapHashSet supports only Member and WeakMember.");
+    static_assert(std::is_trivially_destructible<HeapHashSet>::value,
+                  "HeapHashSet must be trivially destructible.");
+    static_assert(WTF::IsTraceable<ValueArg>::value,
+                  "For hash sets without traceable elements, use HashSet<> "
+                  "instead of HeapHashSet<>.");
+  }
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_COLLECTION_SUPPORT_HEAP_HASH_SET_H_