diff -r 000000000000 -r 6474c204b198 dom/plugins/ipc/COMMessageFilter.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/plugins/ipc/COMMessageFilter.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,84 @@
+/* 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 "base/basictypes.h"
+
+#include "COMMessageFilter.h"
+#include "base/message_loop.h"
+#include "mozilla/plugins/PluginModuleChild.h"
+
+#include <stdio.h>
+
+namespace mozilla {
+namespace plugins {
+
+HRESULT
+COMMessageFilter::QueryInterface(REFIID riid, void** ppv)
+{
+  if (riid == IID_IUnknown || riid == IID_IMessageFilter) {
+    *ppv = static_cast<IMessageFilter*>(this);
+    AddRef();
+    return S_OK;
+  }
+  return E_NOINTERFACE;
+}
+
+DWORD COMMessageFilter::AddRef()
+{
+  ++mRefCnt;
+  return mRefCnt;
+}
+
+DWORD COMMessageFilter::Release()
+{
+  DWORD r = --mRefCnt;
+  if (0 == r)
+    delete this;
+  return r;
+}
+
+DWORD 
+COMMessageFilter::HandleInComingCall(DWORD dwCallType,
+				     HTASK htaskCaller,
+				     DWORD dwTickCount,
+				     LPINTERFACEINFO lpInterfaceInfo)
+{
+  if (mPreviousFilter)
+    return mPreviousFilter->HandleInComingCall(dwCallType, htaskCaller,
+					       dwTickCount, lpInterfaceInfo);
+  return SERVERCALL_ISHANDLED;
+}
+
+DWORD
+COMMessageFilter::RetryRejectedCall(HTASK htaskCallee,
+				    DWORD dwTickCount,
+				    DWORD dwRejectType)
+{
+  if (mPreviousFilter)
+    return mPreviousFilter->RetryRejectedCall(htaskCallee, dwTickCount,
+					      dwRejectType);
+  return -1;
+}
+
+DWORD
+COMMessageFilter::MessagePending(HTASK htaskCallee,
+				 DWORD dwTickCount,
+				 DWORD dwPendingType)
+{
+  mPlugin->FlushPendingInterruptQueue();
+  if (mPreviousFilter)
+    return mPreviousFilter->MessagePending(htaskCallee, dwTickCount,
+					   dwPendingType);
+  return PENDINGMSG_WAITNOPROCESS;
+}
+
+void
+COMMessageFilter::Initialize(PluginModuleChild* module)
+{
+  nsRefPtr<COMMessageFilter> f = new COMMessageFilter(module);
+  ::CoRegisterMessageFilter(f, getter_AddRefs(f->mPreviousFilter));
+}
+
+} // namespace plugins
+} // namespace mozilla