Set ozone_platform_wayland to true for ozone/ChromeOS builds

ui/ozone/ozone.gni

Index: ui/ozone/ozone.gni
diff --git a/ui/ozone/ozone.gni b/ui/ozone/ozone.gni
index d4a43073171cddbe99a7e8eac5b52294cd90b015..629b75f9bb9cfae10b2960d66520bc34999e53a9 100644
--- a/ui/ozone/ozone.gni
+++ b/ui/ozone/ozone.gni
@@ -50,6 +50,7 @@ declare_args() {
     } else if (is_chromeos) {
       ozone_platform_gbm = true
       ozone_platform_x11 = true
+      ozone_platform_wayland = true
     } else {
       # Build all platforms whose deps are in install-build-deps.sh.
       # Only these platforms will be compile tested by buildbots.