Add shell_global_report_error()

Move the "system notification error" handling out of
util.js, and add it to ShellGlobal so we can start
calling it from across the codebase better (including
C).

https://bugzilla.gnome.org/show_bug.cgi?id=644402

src/shell-global.c

@@ -21,6 +21,7 @@
 #include <gdk/gdkx.h>
 #include <gio/gio.h>
 #include <gjs/gjs-module.h>
+#include <girepository.h>
 #include <libxml/parser.h>
 #include <libxml/tree.h>
 #include <libxml/xmlmemory.h>
@@ -102,6 +103,7 @@ enum
  XDND_POSITION_CHANGED,
  XDND_LEAVE,
  XDND_ENTER,
+ NOTIFY_ERROR,
  LAST_SIGNAL
 };
 
@@ -293,6 +295,17 @@ shell_global_class_init (ShellGlobalClass *klass)
                     g_cclosure_marshal_VOID__VOID,
                     G_TYPE_NONE, 0);
 
+  shell_global_signals[NOTIFY_ERROR] =
+      g_signal_new ("notify-error",
+                    G_TYPE_FROM_CLASS (klass),
+                    G_SIGNAL_RUN_LAST,
+                    0,
+                    NULL, NULL,
+                    gi_cclosure_marshal_generic,
+                    G_TYPE_NONE, 2,
+                    G_TYPE_STRING,
+                    G_TYPE_STRING);
+
   g_object_class_install_property (gobject_class,
                                    PROP_OVERLAY_GROUP,
                                    g_param_spec_object ("overlay-group",
@@ -1238,6 +1251,25 @@ shell_global_maybe_gc (ShellGlobal *global)
   gjs_context_maybe_gc (global->js_context);
 }
 
+/**
+ * shell_global_notify_error:
+ * @global: a #ShellGlobal
+ * @msg: Error message
+ * @details: Error details
+ *
+ * Show a system error notification.  Use this function
+ * when a user-initiated action results in a non-fatal problem
+ * from causes that may not be under system control.  For
+ * example, an application crash.
+ */
+void
+shell_global_notify_error (ShellGlobal  *global,
+                           const char   *msg,
+                           const char   *details)
+{
+  g_signal_emit_by_name (global, "notify-error", msg, details);
+}
+
 static void
 grab_notify (GtkWidget *widget, gboolean was_grabbed, gpointer user_data)
 {

src/shell-global.h

@@ -143,6 +143,11 @@ void shell_global_play_theme_sound (ShellGlobal       *global,
 void shell_global_cancel_theme_sound (ShellGlobal     *global,
                                       guint            id);
 
+
+void shell_global_notify_error (ShellGlobal  *global,
+                                const char   *msg,
+                                const char   *details);
+
 void shell_global_init_xdnd (ShellGlobal *global);
 
 typedef void (*ShellGetTpContactCb) (TpConnection *connection,