diff -r 000000000000 -r 6474c204b198 tools/profiler/ProfilerBacktrace.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/profiler/ProfilerBacktrace.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/* -*- 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/. */
+
+#include "JSStreamWriter.h"
+#include "ProfilerBacktrace.h"
+#include "SyncProfile.h"
+
+
+ProfilerBacktrace::ProfilerBacktrace(SyncProfile* aProfile)
+  : mProfile(aProfile)
+{
+  MOZ_ASSERT(aProfile);
+}
+
+ProfilerBacktrace::~ProfilerBacktrace()
+{
+  if (mProfile->ShouldDestroy()) {
+    delete mProfile;
+  }
+}
+
+void
+ProfilerBacktrace::StreamJSObject(JSStreamWriter& b)
+{
+  mozilla::MutexAutoLock lock(*mProfile->GetMutex());
+  mProfile->StreamJSObject(b);
+}