[cogl] Add the missing cogl_is_context() function

[Neil Roberts <nroberts src gnome org>]

commit 55344ff2c482fbef675cc1746933662cd880c578
Author: Neil Roberts <neil linux intel com>
Date:   Wed Jan 4 16:55:25 2012 +0000

    Add the missing cogl_is_context() function
    
    This was missing from the CoglContext header.
    
    Reviewed-by: Robert Bragg <robert linux intel com>

 cogl/cogl-context.h                                |   15 +++++++++++++++
 .../cogl-2.0-experimental-sections.txt             |    1 +
 2 files changed, 16 insertions(+), 0 deletions(-)
---
diff --git a/cogl/cogl-context.h b/cogl/cogl-context.h
index 9c616d3..5d29130 100644
--- a/cogl/cogl-context.h
+++ b/cogl/cogl-context.h
@@ -77,6 +77,21 @@ void
 cogl_android_set_native_window (ANativeWindow *window);
 #endif
 
+/**
+ * cogl_is_context:
+ * @object: An object or %NULL
+ *
+ * Gets whether the given object references an existing context object.
+ *
+ * Return value: %TRUE if the handle references a #CoglContext,
+ *   %FALSE otherwise
+ *
+ * Since: 1.10
+ * Stability: Unstable
+ */
+gboolean
+cogl_is_context (void *object);
+
 G_END_DECLS
 
 #endif /* __COGL_CONTEXT_H__ */
diff --git a/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt b/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt
index 6381a4c..70bb21c 100644
--- a/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt
+++ b/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt
@@ -74,6 +74,7 @@ cogl_wayland_display_set_compositor_display
 
 <SUBSECTION>
 cogl_context_new
+cogl_is_context
 cogl_context_get_display
 
 <SUBSECTION>