[atk] Implement AtkComponent for AtkPlug and AtkSocket.

[Li Yuan <liyuan src gnome org>]

commit 1d4b51f235cf85cf14387dbc0744f0cf6abb6157
Author: Mike Gorse <mgorse novell com>
Date:   Mon Apr 26 15:55:23 2010 +0800

    Implement AtkComponent for AtkPlug and AtkSocket.
    
    Bug #616812.

 atk/atkplug.c   |   10 +++++++++-
 atk/atksocket.c |   11 +++++++++--
 2 files changed, 18 insertions(+), 3 deletions(-)
---
diff --git a/atk/atkplug.c b/atk/atkplug.c
index 4ceb11d..0da67af 100644
--- a/atk/atkplug.c
+++ b/atk/atkplug.c
@@ -20,10 +20,13 @@
 #include "atk.h"
 #include "atkplug.h"
 
-G_DEFINE_TYPE (AtkPlug, atk_plug, ATK_TYPE_OBJECT);
+static void atk_component_interface_init (AtkComponentIface *iface);
 
 static void atk_plug_class_init (AtkPlugClass *klass);
 
+G_DEFINE_TYPE_WITH_CODE (AtkPlug, atk_plug, ATK_TYPE_OBJECT,
+                         G_IMPLEMENT_INTERFACE (ATK_TYPE_COMPONENT, atk_component_interface_init))
+
 static void
 atk_plug_init (AtkPlug* obj)
 {
@@ -35,6 +38,11 @@ atk_plug_class_init (AtkPlugClass* klass)
   klass->get_object_id = NULL;
 }
 
+static void
+atk_component_interface_init (AtkComponentIface *iface)
+{
+}
+
 AtkObject*
 atk_plug_new (void)
 {
diff --git a/atk/atksocket.c b/atk/atksocket.c
index 4fac8be..197c80e 100644
--- a/atk/atksocket.c
+++ b/atk/atksocket.c
@@ -20,10 +20,13 @@
 #include "atk.h"
 #include "atksocket.h"
 
-G_DEFINE_TYPE (AtkSocket, atk_socket, ATK_TYPE_OBJECT);
-
 static void atk_socket_class_init (AtkSocketClass *klass);
 
+static void atk_component_interface_init (AtkComponentIface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (AtkSocket, atk_socket, ATK_TYPE_OBJECT,
+                         G_IMPLEMENT_INTERFACE (ATK_TYPE_COMPONENT, atk_component_interface_init))
+
 static void
 atk_socket_init (AtkSocket* obj)
 {
@@ -36,6 +39,10 @@ atk_socket_class_init (AtkSocketClass* klass)
   klass->embed = NULL;
 }
 
+static void atk_component_interface_init (AtkComponentIface *iface)
+{
+}
+
 AtkObject*
 atk_socket_new (void)
 {