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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
+ * http://w3c.github.io/hr-time/
+ *
+ * Copyright © 2015 W3C® (MIT, ERCIM, Keio, Beihang).
+ * W3C liability, trademark and document use rules apply.
+ */
+
+typedef double DOMHighResTimeStamp;
+typedef sequence <PerformanceEntry> PerformanceEntryList;
+
+[Exposed=(Window,Worker)]
+interface Performance {
+  [DependsOn=DeviceState, Affects=Nothing]
+  DOMHighResTimeStamp now();
+};
+
+[Exposed=Window]
+partial interface Performance {
+  [Constant]
+  readonly attribute PerformanceTiming timing;
+  [Constant]
+  readonly attribute PerformanceNavigation navigation;
+
+  jsonifier;
+};
+
+// http://www.w3.org/TR/performance-timeline/#sec-window.performance-attribute
+[Exposed=(Window,Worker)]
+partial interface Performance {
+  [Func="Performance::IsEnabled"]
+  PerformanceEntryList getEntries();
+  [Func="Performance::IsEnabled"]
+  PerformanceEntryList getEntriesByType(DOMString entryType);
+  [Func="Performance::IsEnabled"]
+  PerformanceEntryList getEntriesByName(DOMString name, optional DOMString
+    entryType);
+};
+
+// http://www.w3.org/TR/resource-timing/#extensions-performance-interface
+[Exposed=Window]
+partial interface Performance {
+  [Func="Performance::IsEnabled"]
+  void clearResourceTimings();
+  [Func="Performance::IsEnabled"]
+  void setResourceTimingBufferSize(unsigned long maxSize);
+  [Func="Performance::IsEnabled"]
+  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;
+};
+
+// http://www.w3.org/TR/user-timing/
+[Exposed=(Window,Worker)]
+partial interface Performance {
+  [Func="Performance::IsEnabled", Throws]
+  void mark(DOMString markName);
+  [Func="Performance::IsEnabled"]
+  void clearMarks(optional DOMString markName);
+  [Func="Performance::IsEnabled", Throws]
+  void measure(DOMString measureName, optional DOMString startMark, optional DOMString endMark);
+  [Func="Performance::IsEnabled"]
+  void clearMeasures(optional DOMString measureName);
+};
+