Add layer-shell protocol from wlroots

This in turn needs xdg_shell from wayland-protocols

src/meson.build

+wayland_protos = dependency('wayland-protocols', version: '>=1.12')
+wl_protocol_dir = wayland_protos.get_pkgconfig_variable('pkgdatadir')
+
 wl_scanner = find_program('wayland-scanner')
 gen_scanner_client_header = generator(wl_scanner,
     output: '@BASENAME@-client-protocol.h',
@@ -15,12 +18,14 @@ phosh_resources = gnome.compile_resources(
 
 
 wl_protos = [
-  'phosh-mobile-shell.xml',
+  '/'.join([wl_protocol_dir, 'stable/xdg-shell/xdg-shell.xml']),
+  '../protocol/phosh-mobile-shell.xml',
+  '../protocol/wlr-layer-shell-unstable-v1.xml',
 ]
 wl_proto_deps = []
 foreach proto: wl_protos
-  wl_proto_deps += gen_scanner_client_header.process('../protocol/' + proto)
-  wl_proto_deps += gen_scanner_client_code.process('../protocol/' + proto)
+  wl_proto_deps += gen_scanner_client_header.process(proto)
+  wl_proto_deps += gen_scanner_client_code.process(proto)
 endforeach
 
 phosh_sources = [

src/phosh.c

@@ -19,6 +19,7 @@
 #include "config.h"
 
 #include "phosh-mobile-shell-client-protocol.h"
+#include "wlr-layer-shell-unstable-v1-client-protocol.h"
 
 #include "phosh.h"
 #include "background.h"