Add the first very basic bits of a geofencing API.

Source/modules/geolocation/Geolocation.idl

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 // http://www.w3.org/TR/geolocation-API/#geolocation_interface
 [
     GarbageCollected,

[Peter Beverloo, 2014/07/11 10:34:34]

Keep in mind that the Geolocation object would have to be exposed in Workers as
well if you want to enable workers to unregister regions. Since the Geolocation
specification makes absolutely no mention of that, it might be nice to discuss
this with Michael.

     NoInterfaceObject,
 ] interface Geolocation {
     // FIXME: should be: PositionOptions options: need PositionOptions.idl and dictionary http:/crbug.com/321462
     [LogActivity] void getCurrentPosition(PositionCallback successCallback,
                                      optional PositionErrorCallback errorCallback,
                                      optional Dictionary options);
 
     // FIXME: should be: PositionOptions options: need PositionOptions.idl and dictionary http:/crbug.com/321462
     [LogActivity] long watchPosition(PositionCallback successCallback,
                                 optional PositionErrorCallback errorCallback,
                                 optional Dictionary options);
 
     void clearWatch(long watchID);
+
+    [RuntimeEnabled=Geofencing, CallWith=ScriptState] Promise registerRegion(GeofencingRegion region);
+    [RuntimeEnabled=Geofencing, CallWith=ScriptState] Promise unregisterRegion(DOMString regionId);
+    [RuntimeEnabled=Geofencing, CallWith=ScriptState] Promise getRegisteredRegions();
 };
-