diff -r 000000000000 -r 6474c204b198 widget/windows/winrt/UIAAccessibilityBridge.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/windows/winrt/UIAAccessibilityBridge.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* -*- Mode: C++; tab-width: 4; 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/. */
+
+#if defined(ACCESSIBILITY)
+
+#include "UIAAccessibilityBridge.h"
+#include "MetroUtils.h"
+
+#include <OAIdl.h>
+
+#include "nsIAccessibleEvent.h"
+#include "nsIAccessibleEditableText.h"
+#include "nsIPersistentProperties2.h"
+
+// generated
+#include "UIABridge.h"
+
+#include <wrl/implements.h>
+
+using namespace mozilla::a11y;
+
+namespace mozilla {
+namespace widget {
+namespace winrt {
+
+using namespace Microsoft::WRL;
+
+NS_IMPL_ISUPPORTS(AccessibilityBridge, nsIObserver)
+
+nsresult
+AccessibilityBridge::Observe(nsISupports *aSubject, const char *aTopic, const char16_t *aData)
+{
+  nsCOMPtr<nsIAccessibleEvent> ev = do_QueryInterface(aSubject);
+  if (!ev) {
+    return NS_OK;
+  }
+
+  uint32_t eventType = 0;
+  ev->GetEventType(&eventType);
+  if (eventType == nsIAccessibleEvent::EVENT_FOCUS) {
+    Microsoft::WRL::ComPtr<IUIABridge> bridgePtr;
+    mBridge.As(&bridgePtr);
+    if (bridgePtr) {
+      bridgePtr->FocusChangeEvent();
+    }
+  }
+
+  return NS_OK;
+}
+
+} } }
+
+#endif // ACCESSIBILITY