diff -r 000000000000 -r 6474c204b198 dom/plugins/ipc/ChildAsyncCall.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/plugins/ipc/ChildAsyncCall.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 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 "ChildAsyncCall.h"
+#include "PluginInstanceChild.h"
+
+namespace mozilla {
+namespace plugins {
+
+ChildAsyncCall::ChildAsyncCall(PluginInstanceChild* instance,
+                               PluginThreadCallback aFunc, void* aUserData)
+  : mInstance(instance)
+  , mFunc(aFunc)
+  , mData(aUserData)
+{
+}
+
+void
+ChildAsyncCall::Cancel()
+{
+  mInstance = nullptr;
+  mFunc = nullptr;
+  mData = nullptr;
+}
+
+void
+ChildAsyncCall::RemoveFromAsyncList()
+{
+  if (mInstance) {
+    MutexAutoLock lock(mInstance->mAsyncCallMutex);
+    mInstance->mPendingAsyncCalls.RemoveElement(this);
+  }
+}
+
+void
+ChildAsyncCall::Run()
+{
+  RemoveFromAsyncList();
+
+  if (mFunc)
+    mFunc(mData);
+}
+
+} // namespace plugins
+} // namespace mozilla