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diff --git a/dom/push/PushManager.h b/dom/push/PushManager.h
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+++ b/dom/push/PushManager.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/. */
+
+/**
+ * PushManager and PushSubscription are exposed on the main and worker threads.
+ * The main thread version is implemented in Push.js. The JS implementation
+ * makes it easier to use certain APIs like the permission prompt and Promises.
+ *
+ * Unfortunately, JS-implemented WebIDL is not supported off the main thread.
+ * To work around this, we use a chain of runnables to query the JS-implemented
+ * nsIPushService component for subscription information, and return the
+ * results to the worker. We don't have to deal with permission prompts, since
+ * we just reject calls if the principal does not have permission.
+ *
+ * On the main thread, PushManager wraps a JS-implemented PushManagerImpl
+ * instance. The C++ wrapper is necessary because our bindings code cannot
+ * accomodate "JS-implemented on the main thread, C++ on the worker" bindings.
+ *
+ * PushSubscription is in C++ on both threads since it isn't particularly
+ * verbose to implement in C++ compared to JS.
+ */
+
+#ifndef mozilla_dom_PushManager_h
+#define mozilla_dom_PushManager_h
+
+#include "nsWrapperCache.h"
+
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/TypedArray.h"
+
+#include "nsCOMPtr.h"
+#include "mozilla/RefPtr.h"
+
+class nsIGlobalObject;
+class nsIPrincipal;
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+
+class OwningArrayBufferViewOrArrayBufferOrString;
+class Promise;
+class PushManagerImpl;
+struct PushSubscriptionOptionsInit;
+class WorkerPrivate;
+
+class PushManager final : public nsISupports, public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(PushManager)
+
+  enum SubscriptionAction {
+    SubscribeAction,
+    GetSubscriptionAction,
+  };
+
+  // The main thread constructor.
+  PushManager(nsIGlobalObject* aGlobal, PushManagerImpl* aImpl);
+
+  // The worker thread constructor.
+  explicit PushManager(const nsAString& aScope);
+
+  nsIGlobalObject* GetParentObject() const { return mGlobal; }
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  static already_AddRefed<PushManager> Constructor(GlobalObject& aGlobal,
+                                                   const nsAString& aScope,
+                                                   ErrorResult& aRv);
+
+  static bool IsEnabled(JSContext* aCx, JSObject* aGlobal);
+
+  already_AddRefed<Promise> PerformSubscriptionActionFromWorker(
+      SubscriptionAction aAction, ErrorResult& aRv);
+
+  already_AddRefed<Promise> PerformSubscriptionActionFromWorker(
+      SubscriptionAction aAction, const PushSubscriptionOptionsInit& aOptions,
+      ErrorResult& aRv);
+
+  already_AddRefed<Promise> Subscribe(
+      const PushSubscriptionOptionsInit& aOptions, ErrorResult& aRv);
+
+  already_AddRefed<Promise> GetSubscription(ErrorResult& aRv);
+
+  already_AddRefed<Promise> PermissionState(
+      const PushSubscriptionOptionsInit& aOptions, ErrorResult& aRv);
+
+ private:
+  ~PushManager();
+
+  nsresult NormalizeAppServerKey(
+      const OwningArrayBufferViewOrArrayBufferOrString& aSource,
+      nsTArray<uint8_t>& aAppServerKey);
+
+  // The following are only set and accessed on the main thread.
+  nsCOMPtr<nsIGlobalObject> mGlobal;
+  RefPtr<PushManagerImpl> mImpl;
+
+  // Only used on the worker thread.
+  nsString mScope;
+};
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_PushManager_h