[gnome-control-center] wacom: Add cc_wacom_tool_get_num_buttons()

[Carlos Garnacho <carlosg src gnome org>]

commit 8122e43b3157e35ddb393fd6e28daa97851ab6a3
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Jun 23 16:50:23 2016 +0200

    wacom: Add cc_wacom_tool_get_num_buttons()
    
    Uses libwacom underneath.

 panels/wacom/cc-wacom-device.c |    8 ++++++++
 panels/wacom/cc-wacom-device.h |    3 +++
 2 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/panels/wacom/cc-wacom-device.c b/panels/wacom/cc-wacom-device.c
index 250370c..e66eefd 100644
--- a/panels/wacom/cc-wacom-device.c
+++ b/panels/wacom/cc-wacom-device.c
@@ -366,3 +366,11 @@ cc_wacom_device_set_output (CcWacomDevice *device,
        g_free (serial);
        g_object_unref (settings);
 }
+
+guint
+cc_wacom_device_get_num_buttons (CcWacomDevice *device)
+{
+       g_return_val_if_fail (CC_IS_WACOM_DEVICE (device), 0);
+
+       return libwacom_get_num_buttons (device->wdevice);
+}
diff --git a/panels/wacom/cc-wacom-device.h b/panels/wacom/cc-wacom-device.h
index e2f76a7..62bf656 100644
--- a/panels/wacom/cc-wacom-device.h
+++ b/panels/wacom/cc-wacom-device.h
@@ -57,4 +57,7 @@ GnomeRROutput * cc_wacom_device_get_output      (CcWacomDevice *device,
 void            cc_wacom_device_set_output      (CcWacomDevice *wacom_device,
                                                 GnomeRROutput *monitor);
 
+guint           cc_wacom_device_get_num_buttons (CcWacomDevice *wacom_device);
+
+
 #endif /* __CC_WACOM_DEVICE_H__ */