app/api: add demo_activate_surface() api_binding

* Added "main_surface" entry to layers.json.
* This surface is never made invisible by activate_surface().

Signed-off-by: Marcus Fritzsch <marcus_fritzsch@mentor.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/layers.hpp b/src/layers.hpp
index a6df4a0..a02eb00 100644
--- a/src/layers.hpp
+++ b/src/layers.hpp
@@ -68,6 +68,7 @@ struct layer_map {
 
    storage_type mapping;
    layers_type layers;
+   int main_surface;
 
    optional<int> get_layer_id(int surface_id);
    optional<genivi::rect> get_layer_rect(int surface_id);