diff -r 000000000000 -r 6474c204b198 dom/fmradio/FMRadioCommon.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/fmradio/FMRadioCommon.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
+/* 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/. */
+
+#ifndef FMRADIOCOMMON_H_
+#define FMRADIOCOMMON_H_
+
+#include "mozilla/Observer.h"
+
+#undef FM_LOG
+#if defined(ANDROID)
+#include <android/log.h>
+#define FM_LOG(FMRADIO_LOG_INFO, args...) \
+  __android_log_print(ANDROID_LOG_INFO, \
+                      FMRADIO_LOG_INFO, \
+                      ## args)
+#else
+#define FM_LOG(args...)
+#endif
+
+#define BEGIN_FMRADIO_NAMESPACE \
+  namespace mozilla { namespace dom {
+#define END_FMRADIO_NAMESPACE \
+  } /* namespace dom */ } /* namespace mozilla */
+
+BEGIN_FMRADIO_NAMESPACE
+
+enum FMRadioEventType
+{
+  FrequencyChanged,
+  EnabledChanged
+};
+
+typedef mozilla::Observer<FMRadioEventType>     FMRadioEventObserver;
+typedef mozilla::ObserverList<FMRadioEventType> FMRadioEventObserverList;
+
+END_FMRADIO_NAMESPACE
+
+#endif /* FMRADIOCOMMON_H_ */
+