diff -r 000000000000 -r 6474c204b198 toolkit/components/perf/PerfMeasurement.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/perf/PerfMeasurement.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,119 @@
+/* -*-  Mode: C++; 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/. */
+
+#include "PerfMeasurement.h"
+#include "jsperf.h"
+#include "mozilla/ModuleUtils.h"
+#include "nsMemory.h"
+#include "mozilla/Preferences.h"
+#include "mozJSComponentLoader.h"
+#include "nsZipArchive.h"
+
+#define JSPERF_CONTRACTID \
+  "@mozilla.org/jsperf;1"
+
+#define JSPERF_CID            \
+{ 0x421c38e6, 0xaee0, 0x4509, \
+  { 0xa0, 0x25, 0x13, 0x0f, 0x43, 0x78, 0x03, 0x5a } }
+
+namespace mozilla {
+namespace jsperf {
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(Module)
+
+NS_IMPL_ISUPPORTS(Module, nsIXPCScriptable)
+
+Module::Module()
+{
+}
+
+Module::~Module()
+{
+}
+
+#define XPC_MAP_CLASSNAME Module
+#define XPC_MAP_QUOTED_CLASSNAME "Module"
+#define XPC_MAP_WANT_CALL
+#define XPC_MAP_FLAGS nsIXPCScriptable::WANT_CALL
+#include "xpc_map_end.h"
+
+static bool
+SealObjectAndPrototype(JSContext* cx, JS::Handle<JSObject *> parent, const char* name)
+{
+  JS::Rooted<JS::Value> prop(cx);
+  if (!JS_GetProperty(cx, parent, name, &prop))
+    return false;
+
+  if (prop.isUndefined()) {
+    // Pretend we sealed the object.
+    return true;
+  }
+
+  JS::Rooted<JSObject*> obj(cx, prop.toObjectOrNull());
+  if (!JS_GetProperty(cx, obj, "prototype", &prop))
+    return false;
+
+  JS::Rooted<JSObject*> prototype(cx, prop.toObjectOrNull());
+  return JS_FreezeObject(cx, obj) && JS_FreezeObject(cx, prototype);
+}
+
+static bool
+InitAndSealPerfMeasurementClass(JSContext* cx, JS::Handle<JSObject*> global)
+{
+  // Init the PerfMeasurement class
+  if (!JS::RegisterPerfMeasurement(cx, global))
+    return false;
+
+  // Seal up Object, Function, and Array and their prototypes.  (This single
+  // object instance is shared amongst everyone who imports the jsperf module.)
+  if (!SealObjectAndPrototype(cx, global, "Object") ||
+      !SealObjectAndPrototype(cx, global, "Function") ||
+      !SealObjectAndPrototype(cx, global, "Array"))
+    return false;
+
+  // Finally, seal the global object, for good measure. (But not recursively;
+  // this breaks things.)
+  return JS_FreezeObject(cx, global);
+}
+
+NS_IMETHODIMP
+Module::Call(nsIXPConnectWrappedNative* wrapper,
+             JSContext* cx,
+             JSObject* obj,
+             const JS::CallArgs& args,
+             bool* _retval)
+{
+
+  mozJSComponentLoader* loader = mozJSComponentLoader::Get();
+  JS::Rooted<JSObject*> targetObj(cx);
+  nsresult rv = loader->FindTargetObject(cx, &targetObj);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  *_retval = InitAndSealPerfMeasurementClass(cx, targetObj);
+  return NS_OK;
+}
+
+}
+}
+
+NS_DEFINE_NAMED_CID(JSPERF_CID);
+
+static const mozilla::Module::CIDEntry kPerfCIDs[] = {
+  { &kJSPERF_CID, false, nullptr, mozilla::jsperf::ModuleConstructor },
+  { nullptr }
+};
+
+static const mozilla::Module::ContractIDEntry kPerfContracts[] = {
+  { JSPERF_CONTRACTID, &kJSPERF_CID },
+  { nullptr }
+};
+
+static const mozilla::Module kPerfModule = {
+  mozilla::Module::kVersion,
+  kPerfCIDs,
+  kPerfContracts
+};
+
+NSMODULE_DEFN(jsperf) = &kPerfModule;