shell-global: Add wrappers for TelepathyLogger

gjs can't support more than one callback in the same function,
so work around this with yet another shell-global wrapper.

https://bugzilla.gnome.org/show_bug.cgi?id=643377

src/shell-global.h

@@ -8,6 +8,7 @@
 #include <gtk/gtk.h>
 #include <meta/meta-plugin.h>
 #include <telepathy-glib/telepathy-glib.h>
+#include <telepathy-logger/telepathy-logger.h>
 
 G_BEGIN_DECLS
 
@@ -165,6 +166,12 @@ void shell_get_self_contact_features (TpConnection *self,
                                       const TpContactFeature *features,
                                       ShellGetSelfContactFeaturesCb callback);
 
+void shell_get_contact_events (TplLogManager *log_manager,
+                               TpAccount *account,
+                               TplEntity *entity,
+                               guint num_events,
+                               GAsyncReadyCallback callback);
+
 G_END_DECLS
 
 #endif /* __SHELL_GLOBAL_H__ */