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diff --git a/docshell/base/timeline/ObservedDocShell.h b/docshell/base/timeline/ObservedDocShell.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_ObservedDocShell_h_
+#define mozilla_ObservedDocShell_h_
+
+#include "MarkersStorage.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+#include "nsTArray.h"
+
+class nsIDocShell;
+
+namespace mozilla {
+class AbstractTimelineMarker;
+
+namespace dom {
+struct ProfileTimelineMarker;
+}
+
+// # ObservedDocShell
+//
+// A wrapper around a docshell for which docshell-specific markers are
+// allowed to exist. See TimelineConsumers for register/unregister logic.
+class ObservedDocShell : public MarkersStorage
+{
+private:
+ RefPtr<nsIDocShell> mDocShell;
+
+ // Main thread only.
+ nsTArray<UniquePtr<AbstractTimelineMarker>> mTimelineMarkers;
+ bool mPopping;
+
+ // Off the main thread only.
+ nsTArray<UniquePtr<AbstractTimelineMarker>> mOffTheMainThreadTimelineMarkers;
+
+public:
+ explicit ObservedDocShell(nsIDocShell* aDocShell);
+ nsIDocShell* operator*() const { return mDocShell.get(); }
+
+ void AddMarker(UniquePtr<AbstractTimelineMarker>&& aMarker) override;
+ void AddOTMTMarker(UniquePtr<AbstractTimelineMarker>&& aMarker) override;
+ void ClearMarkers() override;
+ void PopMarkers(JSContext* aCx, nsTArray<dom::ProfileTimelineMarker>& aStore) override;
+};
+
+} // namespace mozilla
+
+#endif /* mozilla_ObservedDocShell_h_ */