diff -r 000000000000 -r 6474c204b198 dom/battery/Constants.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/battery/Constants.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+#ifndef mozilla_dom_battery_Constants_h__
+#define mozilla_dom_battery_Constants_h__
+
+/**
+ * A set of constants that might need to be used by battery backends.
+ * It's not part of BatteryManager.h to prevent those backends to include it.
+ */
+namespace mozilla {
+namespace dom {
+namespace battery {
+
+  static const double kDefaultLevel         = 1.0;
+  static const bool   kDefaultCharging      = true;
+  static const double kDefaultRemainingTime = 0;
+  static const double kUnknownRemainingTime = -1;
+
+} // namespace battery
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_battery_Constants_h__