diff -r 000000000000 -r 6474c204b198 widget/gonk/OrientationObserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/gonk/OrientationObserver.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,71 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et ft=cpp : */
+/* Copyright 2012 Mozilla Foundation and Mozilla contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef OrientationObserver_h
+#define OrientationObserver_h
+
+#include "mozilla/Observer.h"
+#include "mozilla/dom/ScreenOrientation.h"
+#include "mozilla/Scoped.h"
+
+namespace mozilla {
+class ProcessOrientation;
+namespace hal {
+class SensorData;
+typedef mozilla::Observer<SensorData> ISensorObserver;
+} // namespace hal
+} // namespace mozilla
+
+using mozilla::hal::ISensorObserver;
+using mozilla::hal::SensorData;
+using mozilla::dom::ScreenOrientation;
+
+class OrientationObserver : public ISensorObserver {
+public:
+  OrientationObserver();
+  ~OrientationObserver();
+
+  // Call DisableAutoOrientation on the existing OrientatiOnobserver singleton,
+  // if it exists.  If no OrientationObserver exists, do nothing.
+  static void ShutDown();
+
+  // Notification from sensor.
+  void Notify(const SensorData& aSensorData);
+
+  // Methods to enable/disable automatic orientation.
+  void EnableAutoOrientation();
+  void DisableAutoOrientation();
+
+  // Methods called by methods in hal_impl namespace.
+  bool LockScreenOrientation(ScreenOrientation aOrientation);
+  void UnlockScreenOrientation();
+
+  static OrientationObserver* GetInstance();
+
+private:
+  bool mAutoOrientationEnabled;
+  uint32_t mAllowedOrientations;
+  mozilla::ScopedDeletePtr<mozilla::ProcessOrientation> mOrientation;
+
+  static const uint32_t sDefaultOrientations =
+      mozilla::dom::eScreenOrientation_PortraitPrimary |
+      mozilla::dom::eScreenOrientation_PortraitSecondary |
+      mozilla::dom::eScreenOrientation_LandscapePrimary |
+      mozilla::dom::eScreenOrientation_LandscapeSecondary;
+};
+
+#endif