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diff --git a/dom/webidl/Performance.webidl b/dom/webidl/Performance.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/.
+ *
+ * The origin of this IDL file is
+ * https://w3c.github.io/hr-time/#sec-performance
+ * https://w3c.github.io/navigation-timing/#extensions-to-the-performance-interface
+ * https://w3c.github.io/performance-timeline/#extensions-to-the-performance-interface
+ * https://w3c.github.io/resource-timing/#sec-extensions-performance-interface
+ * https://w3c.github.io/user-timing/#extensions-performance-interface
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio, Beihang).
+ * W3C liability, trademark and document use rules apply.
+ */
+
+// DOMTimeStamp is deprecated, use EpochTimeStamp instead.
+typedef unsigned long long DOMTimeStamp;
+typedef unsigned long long EpochTimeStamp;
+typedef double DOMHighResTimeStamp;
+typedef sequence <PerformanceEntry> PerformanceEntryList;
+
+// https://w3c.github.io/hr-time/#sec-performance
+[Exposed=(Window,Worker)]
+interface Performance : EventTarget {
+  [DependsOn=DeviceState, Affects=Nothing]
+  DOMHighResTimeStamp now();
+
+  [Constant]
+  readonly attribute DOMHighResTimeStamp timeOrigin;
+
+  [Default] object toJSON();
+};
+
+// https://w3c.github.io/navigation-timing/#extensions-to-the-performance-interface
+[Exposed=Window]
+partial interface Performance {
+  [Constant]
+  readonly attribute PerformanceTiming timing;
+  [Constant]
+  readonly attribute PerformanceNavigation navigation;
+};
+
+// https://w3c.github.io/performance-timeline/#extensions-to-the-performance-interface
+[Exposed=(Window,Worker)]
+partial interface Performance {
+  PerformanceEntryList getEntries();
+  PerformanceEntryList getEntriesByType(DOMString entryType);
+  PerformanceEntryList getEntriesByName(DOMString name, optional DOMString
+    entryType);
+};
+
+// https://w3c.github.io/resource-timing/#sec-extensions-performance-interface
+[Exposed=(Window,Worker)]
+partial interface Performance {
+  undefined clearResourceTimings();
+  undefined setResourceTimingBufferSize(unsigned long maxSize);
+  attribute EventHandler onresourcetimingbufferfull;
+};
+
+// GC microbenchmarks, pref-guarded, not for general use (bug 1125412)
+[Exposed=Window]
+partial interface Performance {
+  [Pref="dom.enable_memory_stats"]
+  readonly attribute object mozMemory;
+};
+
+// https://w3c.github.io/user-timing/#extensions-performance-interface
+dictionary PerformanceMarkOptions {
+  any detail;
+  DOMHighResTimeStamp startTime;
+};
+
+// https://w3c.github.io/user-timing/#extensions-performance-interface
+dictionary PerformanceMeasureOptions {
+  any detail;
+  (DOMString or DOMHighResTimeStamp) start;
+  DOMHighResTimeStamp duration;
+  (DOMString or DOMHighResTimeStamp) end;
+};
+
+// https://w3c.github.io/user-timing/#extensions-performance-interface
+[Exposed=(Window,Worker)]
+partial interface Performance {
+  [Throws]
+  PerformanceMark mark(DOMString markName, optional PerformanceMarkOptions markOptions = {});
+  undefined clearMarks(optional DOMString markName);
+  [Throws]
+  PerformanceMeasure measure(DOMString measureName, optional (DOMString or PerformanceMeasureOptions) startOrMeasureOptions = {}, optional DOMString endMark);
+  undefined clearMeasures(optional DOMString measureName);
+};
+
+[Exposed=Window]
+partial interface Performance {
+  [Pref="dom.enable_event_timing", SameObject]
+  readonly attribute EventCounts eventCounts;
+};