gsettings: Add migration file for overrides

Mutter/Metacity settings overridden by the shell have not been
migrated when moving to GSettings, but there's no good reason not
to migrate those preferences as well.

https://bugzilla.gnome.org/show_bug.cgi?id=667636

data/Makefile.am

@@ -59,6 +59,8 @@ gschemas.compiled: $(gsettings_SCHEMAS:.xml=.valid)
 
 all-local: gschemas.compiled
 
+convertdir = $(datadir)/GConf/gsettings
+convert_DATA = gnome-shell-overrides.convert
 
 shadersdir = $(pkgdatadir)/shaders
 shaders_DATA = \
@@ -69,6 +71,7 @@ EXTRA_DIST =						\
 	gnome-shell.desktop.in.in			\
 	$(menu_DATA)					\
 	$(shaders_DATA)					\
+	$(convert_DATA)					\
 	org.gnome.shell.gschema.xml.in
 
 CLEANFILES =						\

data/gnome-shell-overrides.convert

@@ -0,0 +1,5 @@
+[org.gnome.shell.overrides]
+attach-modal-dialogs = /desktop/gnome/shell/windows/attach_modal_dialogs
+button-layout = /desktop/gnome/shell/windows/button_layout
+edge-tiling = /desktop/gnome/shell/windows/edge_tiling
+workspaces-only-on-primary = /desktop/gnome/shell/windows/workspaces_only_on_primary