cogl-path: Adds missing cogl_is_path prototype

This adds a missing cogl_is_path prototype to the public cogl-path.h
header.

clutter/cogl/cogl/cogl-path.h

@@ -53,6 +53,18 @@ G_BEGIN_DECLS
 
 typedef struct _CoglPath CoglPath;
 
+/**
+ * cogl_is_path:
+ * @handle: A CoglHandle
+ *
+ * Gets whether the given handle references an existing path object.
+ *
+ * Return value: %TRUE if the handle references a #CoglPath,
+ *   %FALSE otherwise
+ */
+gboolean
+cogl_is_path (CoglHandle handle);
+
 /**
  * cogl_path_fill:
  *

doc/reference/cogl/cogl-sections.txt

@@ -154,6 +154,7 @@ cogl_rectangle_with_multitexture_coords
 cogl_polygon
 
 <SUBSECTION>
+cogl_is_path
 cogl_path_new
 cogl_get_path
 cogl_set_path