EdgeExtension: add java-visible flag target

Bug: 322036393
Test: atest TransitionAnimationTests
Flag: com.android.graphics.libgui.flags.edge_extension_shader
Change-Id: I8e88df0819c504d9e3dd31d0f0e39a192bbc2587
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index 7a1add3..6b8baf8 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -99,6 +99,7 @@
         "framework_graphics_flags_java_lib",
         "hwui_flags_java_lib",
         "libcore_exported_aconfig_flags_lib",
+        "libgui_flags_java_lib",
         "power_flags_lib",
         "sdk_sandbox_flags_lib",
         "surfaceflinger_flags_java_lib",
@@ -1208,6 +1209,12 @@
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
 
+java_aconfig_library {
+    name: "libgui_flags_java_lib",
+    aconfig_declarations: "libgui_flags",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}
+
 // Content Capture
 aconfig_declarations {
     name: "android.view.contentcapture.flags-aconfig",