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diff --git a/dom/media/eme/DetailedPromise.h b/dom/media/eme/DetailedPromise.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 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 __DetailedPromise_h__
+#define __DetailedPromise_h__
+
+#include "mozilla/dom/Promise.h"
+#include "mozilla/Telemetry.h"
+#include "EMEUtils.h"
+
+namespace mozilla {
+namespace dom {
+
+/*
+ * This is pretty horrible; bug 1160445.
+ * Extend Promise to add custom DOMException messages on rejection.
+ * Get rid of this once we've ironed out EME errors in the wild.
+ */
+class DetailedPromise : public Promise
+{
+public:
+ static already_AddRefed<DetailedPromise>
+ Create(nsIGlobalObject* aGlobal,
+ ErrorResult& aRv,
+ const nsACString& aName);
+
+ static already_AddRefed<DetailedPromise>
+ Create(nsIGlobalObject* aGlobal, ErrorResult& aRv,
+ const nsACString& aName,
+ Telemetry::ID aSuccessLatencyProbe,
+ Telemetry::ID aFailureLatencyProbe);
+
+ template <typename T>
+ void MaybeResolve(const T& aArg)
+ {
+ EME_LOG("%s promise resolved", mName.get());
+ MaybeReportTelemetry(Succeeded);
+ Promise::MaybeResolve<T>(aArg);
+ }
+
+ void MaybeReject(nsresult aArg) = delete;
+ void MaybeReject(nsresult aArg, const nsACString& aReason);
+
+ void MaybeReject(ErrorResult& aArg) = delete;
+ void MaybeReject(ErrorResult&, const nsACString& aReason);
+
+private:
+ explicit DetailedPromise(nsIGlobalObject* aGlobal,
+ const nsACString& aName);
+
+ explicit DetailedPromise(nsIGlobalObject* aGlobal,
+ const nsACString& aName,
+ Telemetry::ID aSuccessLatencyProbe,
+ Telemetry::ID aFailureLatencyProbe);
+ virtual ~DetailedPromise();
+
+ enum Status { Succeeded, Failed };
+ void MaybeReportTelemetry(Status aStatus);
+
+ nsCString mName;
+ bool mResponded;
+ TimeStamp mStartTime;
+ Optional<Telemetry::ID> mSuccessLatencyProbe;
+ Optional<Telemetry::ID> mFailureLatencyProbe;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // __DetailedPromise_h__