diff -r 000000000000 -r 6474c204b198 dom/events/CommandEvent.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/events/CommandEvent.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,76 @@
+/* -*- 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 "mozilla/dom/CommandEvent.h"
+#include "mozilla/MiscEvents.h"
+#include "prtime.h"
+
+namespace mozilla {
+namespace dom {
+
+CommandEvent::CommandEvent(EventTarget* aOwner,
+                           nsPresContext* aPresContext,
+                           WidgetCommandEvent* aEvent)
+  : Event(aOwner, aPresContext,
+          aEvent ? aEvent :
+                   new WidgetCommandEvent(false, nullptr, nullptr, nullptr))
+{
+  mEvent->time = PR_Now();
+  if (aEvent) {
+    mEventIsInternal = false;
+  } else {
+    mEventIsInternal = true;
+  }
+}
+
+NS_INTERFACE_MAP_BEGIN(CommandEvent)
+  NS_INTERFACE_MAP_ENTRY(nsIDOMCommandEvent)
+NS_INTERFACE_MAP_END_INHERITING(Event)
+
+NS_IMPL_ADDREF_INHERITED(CommandEvent, Event)
+NS_IMPL_RELEASE_INHERITED(CommandEvent, Event)
+
+NS_IMETHODIMP
+CommandEvent::GetCommand(nsAString& aCommand)
+{
+  nsIAtom* command = mEvent->AsCommandEvent()->command;
+  if (command) {
+    command->ToString(aCommand);
+  } else {
+    aCommand.Truncate();
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+CommandEvent::InitCommandEvent(const nsAString& aTypeArg,
+                               bool aCanBubbleArg,
+                               bool aCancelableArg,
+                               const nsAString& aCommand)
+{
+  nsresult rv = Event::InitEvent(aTypeArg, aCanBubbleArg, aCancelableArg);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mEvent->AsCommandEvent()->command = do_GetAtom(aCommand);
+  return NS_OK;
+}
+
+} // namespace dom
+} // namespace mozilla
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+nsresult
+NS_NewDOMCommandEvent(nsIDOMEvent** aInstancePtrResult,
+                      EventTarget* aOwner,
+                      nsPresContext* aPresContext,
+                      WidgetCommandEvent* aEvent)
+{
+  CommandEvent* it = new CommandEvent(aOwner, aPresContext, aEvent);
+  NS_ADDREF(it);
+  *aInstancePtrResult = static_cast<Event*>(it);
+  return NS_OK;
+}