[mutter] DisplayConfig: Add "is_builtin" monitor property

[Jonas Ådahl <jadahl src gnome org>]

commit 6c8b103a7b2133c2e9f9d0eb8e23de20dcbe5fef
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Mar 23 23:33:34 2017 +0800

    DisplayConfig: Add "is_builtin" monitor property
    
    Add a per-monitor property allowing the application to determine
    whether the monitor is builtin or not, e.g. a laptop panel.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=777732

 src/backends/meta-monitor-manager.c    |    6 ++++++
 src/org.gnome.Mutter.DisplayConfig.xml |    3 +++
 2 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index 976ecbf..85441f7 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -1417,6 +1417,7 @@ meta_monitor_manager_handle_get_current_state (MetaDBusDisplayConfig *skeleton,
       GVariantBuilder modes_builder;
       GVariantBuilder monitor_properties_builder;
       GList *k;
+      gboolean is_builtin;
 
       current_mode = meta_monitor_get_current_mode (monitor);
       preferred_mode = meta_monitor_get_preferred_mode (monitor);
@@ -1458,6 +1459,11 @@ meta_monitor_manager_handle_get_current_state (MetaDBusDisplayConfig *skeleton,
                                  g_variant_new_boolean (is_underscanning));
         }
 
+      is_builtin = meta_monitor_is_laptop_panel (monitor);
+      g_variant_builder_add (&monitor_properties_builder, "{sv}",
+                             "is_builtin",
+                             g_variant_new_boolean (is_builtin));
+
       g_variant_builder_add (&monitors_builder, MONITOR_FORMAT,
                              monitor_spec->connector,
                              monitor_spec->vendor,
diff --git a/src/org.gnome.Mutter.DisplayConfig.xml b/src/org.gnome.Mutter.DisplayConfig.xml
index 961ed03..c916b36 100644
--- a/src/org.gnome.Mutter.DisplayConfig.xml
+++ b/src/org.gnome.Mutter.DisplayConfig.xml
@@ -331,6 +331,9 @@
            - "max_screen_size" (ii): the maximum size a screen may have
                                      (absence of this means unlimited screen
                                      size)
+           - "is_builtin" (b): whether the monitor is built in, e.g. a
+                               laptop panel (absence of this means it is
+                               not built in)
 
         Possible mode flags:
          1 : preferred mode