[gtk+] inspector: Add an origin mark to the slowdown scale

[Matthias Clasen <matthiasc src gnome org>]

commit d83ad00f9ec245014f45d426abad8180945563db
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Apr 9 11:54:07 2016 -0400

    inspector: Add an origin mark to the slowdown scale
    
    Makes it easier to get back to the original speed.

 gtk/inspector/visual.ui |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gtk/inspector/visual.ui b/gtk/inspector/visual.ui
index 09035c4..9f30af8 100644
--- a/gtk/inspector/visual.ui
+++ b/gtk/inspector/visual.ui
@@ -425,6 +425,9 @@
                             <property name="adjustment">slowdown_adjustment</property>
                             <property name="valign">baseline</property>
                             <property name="draw_value">0</property>
+                            <marks>
+                              <mark value="0.0" position="top"/>
+                            </marks>
                           </object>
                           <packing>
                             <property name="expand">True</property>