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diff --git a/docshell/base/timeline/DocLoadingTimelineMarker.h b/docshell/base/timeline/DocLoadingTimelineMarker.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_DocLoadingTimelineMarker_h_
+#define mozilla_DocLoadingTimelineMarker_h_
+
+#include "TimelineMarker.h"
+#include "mozilla/dom/ProfileTimelineMarkerBinding.h"
+
+namespace mozilla {
+
+class DocLoadingTimelineMarker : public TimelineMarker
+{
+public:
+ explicit DocLoadingTimelineMarker(const char* aName)
+ : TimelineMarker(aName, MarkerTracingType::TIMESTAMP)
+ , mUnixTime(PR_Now())
+ {}
+
+ virtual void AddDetails(JSContext* aCx, dom::ProfileTimelineMarker& aMarker) override
+ {
+ TimelineMarker::AddDetails(aCx, aMarker);
+ aMarker.mUnixTime.Construct(mUnixTime);
+ }
+
+private:
+ // Certain consumers might use Date.now() or similar for tracing time.
+ // However, TimelineMarkers use process creation as an epoch, which provides
+ // more precision. To allow syncing, attach an additional unix timestamp.
+ // Using this instead of `AbstractTimelineMarker::GetTime()'s` timestamp
+ // is strongly discouraged.
+ PRTime mUnixTime;
+};
+
+} // namespace mozilla
+
+#endif // mozilla_DocLoadingTimelineMarker_h_