[gnome-maps] MapMarker: implement surface property

[Jonas Danielsson <jonasdn src gnome org>]

commit d13d1edb1f01a0c12fcde92692989abfe2f7e8db
Author: Hashem Nasarat <hashem riseup net>
Date:   Thu Jan 14 18:39:00 2016 -0500

    MapMarker: implement surface property
    
    625b5458 implemented the ChamplainExportable interface but didn't add
    the property to the class, which caused the following message at
    runtime:
    
    GLib-GObject-CRITICAL **: Object class Gjs_MapMarker doesn't implement
    property 'surface' from interface 'ChamplainExportable'
    
    https://bugzilla.gnome.org/show_bug.cgi?id=760647

 src/mapMarker.js |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/mapMarker.js b/src/mapMarker.js
index 81fe37e..ce70716 100644
--- a/src/mapMarker.js
+++ b/src/mapMarker.js
@@ -39,6 +39,10 @@ const MapMarker = new Lang.Class({
     Signals: {
         'gone-to': { }
     },
+    Properties: {
+        'surface': GObject.ParamSpec.override('surface',
+                                              Champlain.Exportable)
+    },
 
     _init: function(params) {
         this._place = params.place;