diff -r 000000000000 -r 6474c204b198 hal/fallback/FallbackScreenConfiguration.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hal/fallback/FallbackScreenConfiguration.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,63 @@
+/* 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 "Hal.h"
+#include "mozilla/dom/ScreenOrientation.h"
+#include "nsIScreenManager.h"
+#include "nsServiceManagerUtils.h"
+
+namespace mozilla {
+namespace hal_impl {
+
+void
+EnableScreenConfigurationNotifications()
+{
+}
+
+void
+DisableScreenConfigurationNotifications()
+{
+}
+
+void
+GetCurrentScreenConfiguration(hal::ScreenConfiguration* aScreenConfiguration)
+{
+  nsresult rv;
+  nsCOMPtr<nsIScreenManager> screenMgr =
+    do_GetService("@mozilla.org/gfx/screenmanager;1", &rv);
+  if (NS_FAILED(rv)) {
+    NS_ERROR("Can't find nsIScreenManager!");
+    return;
+  }
+
+  nsIntRect rect;
+  int32_t colorDepth, pixelDepth;
+  dom::ScreenOrientation orientation;
+  nsCOMPtr<nsIScreen> screen;
+
+  screenMgr->GetPrimaryScreen(getter_AddRefs(screen));
+  screen->GetRect(&rect.x, &rect.y, &rect.width, &rect.height);
+  screen->GetColorDepth(&colorDepth);
+  screen->GetPixelDepth(&pixelDepth);
+  orientation = rect.width >= rect.height
+                ? dom::eScreenOrientation_LandscapePrimary
+                : dom::eScreenOrientation_PortraitPrimary;
+
+  *aScreenConfiguration =
+      hal::ScreenConfiguration(rect, orientation, colorDepth, pixelDepth);
+}
+
+bool
+LockScreenOrientation(const dom::ScreenOrientation& aOrientation)
+{
+  return false;
+}
+
+void
+UnlockScreenOrientation()
+{
+}
+
+} // hal_impl
+} // mozilla