diff -r 000000000000 -r 6474c204b198 accessible/src/atk/nsMaiInterfaceComponent.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/accessible/src/atk/nsMaiInterfaceComponent.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,116 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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 "InterfaceInitFuncs.h"
+
+#include "AccessibleWrap.h"
+#include "nsAccUtils.h"
+#include "nsCoreUtils.h"
+#include "nsMai.h"
+#include "mozilla/Likely.h"
+
+using namespace mozilla::a11y;
+
+extern "C" {
+
+static AtkObject*
+refAccessibleAtPointCB(AtkComponent* aComponent, gint aAccX, gint aAccY,
+                       AtkCoordType aCoordType)
+{
+  return refAccessibleAtPointHelper(GetAccessibleWrap(ATK_OBJECT(aComponent)),
+                                    aAccX, aAccY, aCoordType);
+}
+
+static void
+getExtentsCB(AtkComponent* aComponent, gint* aX, gint* aY,
+             gint* aWidth, gint* aHeight, AtkCoordType aCoordType)
+{
+  getExtentsHelper(GetAccessibleWrap(ATK_OBJECT(aComponent)),
+                   aX, aY, aWidth, aHeight, aCoordType);
+}
+
+static gboolean
+grabFocusCB(AtkComponent* aComponent)
+{
+  AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aComponent));
+  if (!accWrap)
+    return FALSE;
+
+  nsresult rv = accWrap->TakeFocus();
+  return (NS_FAILED(rv)) ? FALSE : TRUE;
+}
+}
+
+AtkObject*
+refAccessibleAtPointHelper(AccessibleWrap* aAccWrap, gint aX, gint aY,
+                           AtkCoordType aCoordType)
+{
+  if (!aAccWrap || aAccWrap->IsDefunct() || nsAccUtils::MustPrune(aAccWrap))
+    return nullptr;
+
+  // Accessible::ChildAtPoint(x,y) is in screen pixels.
+  if (aCoordType == ATK_XY_WINDOW) {
+    nsIntPoint winCoords =
+      nsCoreUtils::GetScreenCoordsForWindow(aAccWrap->GetNode());
+    aX += winCoords.x;
+    aY += winCoords.y;
+  }
+
+  Accessible* accAtPoint = aAccWrap->ChildAtPoint(aX, aY,
+                                                  Accessible::eDirectChild);
+  if (!accAtPoint)
+    return nullptr;
+
+  AtkObject* atkObj = AccessibleWrap::GetAtkObject(accAtPoint);
+  if (atkObj)
+    g_object_ref(atkObj);
+  return atkObj;
+}
+
+void
+getExtentsHelper(AccessibleWrap* aAccWrap,
+                 gint* aX, gint* aY, gint* aWidth, gint* aHeight,
+                 AtkCoordType aCoordType)
+{
+  *aX = *aY = *aWidth = *aHeight = 0;
+
+  if (!aAccWrap || aAccWrap->IsDefunct())
+    return;
+
+  int32_t x = 0, y = 0, width = 0, height = 0;
+  // Returned in screen coordinates
+  nsresult rv = aAccWrap->GetBounds(&x, &y, &width, &height);
+  if (NS_FAILED(rv))
+    return;
+
+  if (aCoordType == ATK_XY_WINDOW) {
+    nsIntPoint winCoords =
+      nsCoreUtils::GetScreenCoordsForWindow(aAccWrap->GetNode());
+    x -= winCoords.x;
+    y -= winCoords.y;
+  }
+
+  *aX = x;
+  *aY = y;
+  *aWidth = width;
+  *aHeight = height;
+}
+
+void
+componentInterfaceInitCB(AtkComponentIface* aIface)
+{
+  NS_ASSERTION(aIface, "Invalid Interface");
+  if(MOZ_UNLIKELY(!aIface))
+    return;
+
+  /*
+   * Use default implementation in atk for contains, get_position,
+   * and get_size
+   */
+  aIface->ref_accessible_at_point = refAccessibleAtPointCB;
+  aIface->get_extents = getExtentsCB;
+  aIface->grab_focus = grabFocusCB;
+}