Introduce com::android::graphics::libgui::flags::edge_extension_shader()

Bug: 322036393
Test: N/A
Flag: com.android.graphics.libgui.flags.edge_extension_shader

Change-Id: I982bb8aa3848ce8503bf0150b272c60d7db2b63f
diff --git a/libs/gui/libgui_flags.aconfig b/libs/gui/libgui_flags.aconfig
index 2d70052..74d806e 100644
--- a/libs/gui/libgui_flags.aconfig
+++ b/libs/gui/libgui_flags.aconfig
@@ -43,3 +43,11 @@
   bug: "340933794"
   is_fixed_read_only: true
 } # wb_platform_api_improvements
+
+flag {
+  name: "edge_extension_shader"
+  namespace: "windowing_frontend"
+  description: "Enable edge extension via shader"
+  bug: "322036393"
+  is_fixed_read_only: true
+} # edge_extension_shader