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diff --git a/dom/bindings/test/TestInterfaceObservableArray.h b/dom/bindings/test/TestInterfaceObservableArray.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_TestInterfaceObservableArray_h
+#define mozilla_dom_TestInterfaceObservableArray_h
+
+#include "nsCOMPtr.h"
+#include "nsWrapperCache.h"
+#include "nsTArray.h"
+
+class nsPIDOMWindowInner;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+class GlobalObject;
+class SetDeleteBooleanCallback;
+class SetDeleteInterfaceCallback;
+class SetDeleteObjectCallback;
+struct ObservableArrayCallbacks;
+
+// Implementation of test binding for webidl ObservableArray type, using
+// primitives for value type
+class TestInterfaceObservableArray final : public nsISupports,
+                                           public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(TestInterfaceObservableArray)
+
+  nsPIDOMWindowInner* GetParentObject() const;
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+  static already_AddRefed<TestInterfaceObservableArray> Constructor(
+      const GlobalObject& aGlobal, const ObservableArrayCallbacks& aCallbacks,
+      ErrorResult& rv);
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  void OnSetObservableArrayObject(JSContext* aCx, JS::Handle<JSObject*> aValue,
+                                  uint32_t aIndex, ErrorResult& aRv);
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  void OnDeleteObservableArrayObject(JSContext* aCx,
+                                     JS::Handle<JSObject*> aValue,
+                                     uint32_t aIndex, ErrorResult& aRv);
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  void OnSetObservableArrayBoolean(bool aValue, uint32_t aIndex,
+                                   ErrorResult& aRv);
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  void OnDeleteObservableArrayBoolean(bool aValue, uint32_t aIndex,
+                                      ErrorResult& aRv);
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  void OnSetObservableArrayInterface(TestInterfaceObservableArray* aValue,
+                                     uint32_t aIndex, ErrorResult& aRv);
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  void OnDeleteObservableArrayInterface(TestInterfaceObservableArray* aValue,
+                                        uint32_t aIndex, ErrorResult& aRv);
+
+  bool BooleanElementAtInternal(uint32_t aIndex, ErrorResult& aRv);
+  void ObjectElementAtInternal(JSContext* aCx, uint32_t aIndex,
+                               JS::MutableHandle<JSObject*> aValue,
+                               ErrorResult& aRv);
+  already_AddRefed<TestInterfaceObservableArray> InterfaceElementAtInternal(
+      uint32_t aIndex, ErrorResult& aRv);
+
+  void BooleanReplaceElementAtInternal(uint32_t aIndex, bool aValue,
+                                       ErrorResult& aRv);
+  void ObjectReplaceElementAtInternal(JSContext* aCx, uint32_t aIndex,
+                                      JS::Handle<JSObject*> aValue,
+                                      ErrorResult& aRv);
+  void InterfaceReplaceElementAtInternal(uint32_t aIndex,
+                                         TestInterfaceObservableArray& aValue,
+                                         ErrorResult& aRv);
+
+  void BooleanAppendElementInternal(bool aValue, ErrorResult& aRv);
+  void ObjectAppendElementInternal(JSContext* aCx, JS::Handle<JSObject*> aValue,
+                                   ErrorResult& aRv);
+  void InterfaceAppendElementInternal(TestInterfaceObservableArray& aValue,
+                                      ErrorResult& aRv);
+
+  void BooleanRemoveLastElementInternal(ErrorResult& aRv);
+  void ObjectRemoveLastElementInternal(ErrorResult& aRv);
+  void InterfaceRemoveLastElementInternal(ErrorResult& aRv);
+
+  uint32_t BooleanLengthInternal(ErrorResult& aRv);
+  uint32_t ObjectLengthInternal(ErrorResult& aRv);
+  uint32_t InterfaceLengthInternal(ErrorResult& aRv);
+
+ private:
+  explicit TestInterfaceObservableArray(
+      nsPIDOMWindowInner* aParent, const ObservableArrayCallbacks& aCallbacks);
+  virtual ~TestInterfaceObservableArray() = default;
+
+  nsCOMPtr<nsPIDOMWindowInner> mParent;
+  RefPtr<SetDeleteBooleanCallback> mSetBooleanCallback;
+  RefPtr<SetDeleteBooleanCallback> mDeleteBooleanCallback;
+  RefPtr<SetDeleteObjectCallback> mSetObjectCallback;
+  RefPtr<SetDeleteObjectCallback> mDeleteObjectCallback;
+  RefPtr<SetDeleteInterfaceCallback> mSetInterfaceCallback;
+  RefPtr<SetDeleteInterfaceCallback> mDeleteInterfaceCallback;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_TestInterfaceObservableArray_h