diff -r 000000000000 -r 6474c204b198 dom/events/ScrollAreaEvent.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/events/ScrollAreaEvent.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,110 @@
+/* -*- 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 "base/basictypes.h"
+#include "ipc/IPCMessageUtils.h"
+#include "mozilla/dom/DOMRect.h"
+#include "mozilla/dom/ScrollAreaEvent.h"
+#include "mozilla/ContentEvents.h"
+
+namespace mozilla {
+namespace dom {
+
+ScrollAreaEvent::ScrollAreaEvent(EventTarget* aOwner,
+                                 nsPresContext* aPresContext,
+                                 InternalScrollAreaEvent* aEvent)
+  : UIEvent(aOwner, aPresContext, aEvent)
+  , mClientArea(nullptr)
+{
+  mClientArea.SetLayoutRect(aEvent ? aEvent->mArea : nsRect());
+}
+
+NS_IMPL_ADDREF_INHERITED(ScrollAreaEvent, UIEvent)
+NS_IMPL_RELEASE_INHERITED(ScrollAreaEvent, UIEvent)
+
+NS_INTERFACE_MAP_BEGIN(ScrollAreaEvent)
+  NS_INTERFACE_MAP_ENTRY(nsIDOMScrollAreaEvent)
+NS_INTERFACE_MAP_END_INHERITING(UIEvent)
+
+
+#define FORWARD_GETTER(_name)                                                  \
+  NS_IMETHODIMP                                                                \
+  ScrollAreaEvent::Get ## _name(float* aResult)                                \
+  {                                                                            \
+    *aResult = _name();                                                        \
+    return NS_OK;                                                              \
+  }
+
+FORWARD_GETTER(X)
+FORWARD_GETTER(Y)
+FORWARD_GETTER(Width)
+FORWARD_GETTER(Height)
+
+NS_IMETHODIMP
+ScrollAreaEvent::InitScrollAreaEvent(const nsAString& aEventType,
+                                     bool aCanBubble,
+                                     bool aCancelable,
+                                     nsIDOMWindow* aView,
+                                     int32_t aDetail,
+                                     float aX,
+                                     float aY,
+                                     float aWidth,
+                                     float aHeight)
+{
+  nsresult rv =
+    UIEvent::InitUIEvent(aEventType, aCanBubble, aCancelable, aView, aDetail);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mClientArea.SetRect(aX, aY, aWidth, aHeight);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP_(void)
+ScrollAreaEvent::Serialize(IPC::Message* aMsg,
+                           bool aSerializeInterfaceType)
+{
+  if (aSerializeInterfaceType) {
+    IPC::WriteParam(aMsg, NS_LITERAL_STRING("scrollareaevent"));
+  }
+
+  Event::Serialize(aMsg, false);
+
+  IPC::WriteParam(aMsg, X());
+  IPC::WriteParam(aMsg, Y());
+  IPC::WriteParam(aMsg, Width());
+  IPC::WriteParam(aMsg, Height());
+}
+
+NS_IMETHODIMP_(bool)
+ScrollAreaEvent::Deserialize(const IPC::Message* aMsg, void** aIter)
+{
+  NS_ENSURE_TRUE(Event::Deserialize(aMsg, aIter), false);
+
+  float x, y, width, height;
+  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &x), false);
+  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &y), false);
+  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &width), false);
+  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &height), false);
+  mClientArea.SetRect(x, y, width, height);
+
+  return true;
+}
+
+} // namespace dom
+} // namespace mozilla
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+nsresult
+NS_NewDOMScrollAreaEvent(nsIDOMEvent** aInstancePtrResult,
+                         EventTarget* aOwner,
+                         nsPresContext* aPresContext,
+                         InternalScrollAreaEvent* aEvent)
+{
+  ScrollAreaEvent* ev = new ScrollAreaEvent(aOwner, aPresContext, aEvent);
+  return CallQueryInterface(ev, aInstancePtrResult);
+}