diff -r 000000000000 -r 6474c204b198 dom/plugins/ipc/NestedLoopTimer.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/plugins/ipc/NestedLoopTimer.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: sw=4 ts=4 et :
+ * 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 <QtCore/QTimer>
+
+#include "NestedLoopTimer.h"
+#include "mozilla/plugins/PluginModuleChild.h"
+
+namespace mozilla {
+namespace plugins {
+
+NestedLoopTimer::NestedLoopTimer(PluginModuleChild *pmc):
+     QObject(), mModule(pmc), mQTimer(nullptr)
+{
+}
+
+NestedLoopTimer::~NestedLoopTimer()
+{
+    if (mQTimer) {
+        mQTimer->stop();
+        delete mQTimer;
+        mQTimer = nullptr;
+    }
+}
+
+void NestedLoopTimer::timeOut()
+{
+    // just detected a nested loop; start a timer that will
+    // periodically rpc-call back into the browser and process some
+    // events
+    mQTimer = new QTimer(this);
+    QObject::connect(mQTimer, SIGNAL(timeout()), this,
+                     SLOT(processSomeEvents()));
+    mQTimer->setInterval(kNestedLoopDetectorIntervalMs);
+    mQTimer->start();
+}
+
+void NestedLoopTimer::processSomeEvents()
+{
+    if (mModule)
+        mModule->CallProcessSomeEvents();
+}
+
+} /* namespace plugins */
+} /* namespace mozilla */