Set up aconfig / new android.service.chooser flag

Test: (see the `nfc-custom-chooser` topic, e.g. ag/25438835)
Bug: 268089816
Change-Id: I6c721a9779b36eedaf708fdaace62344feb4a49d
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index b54022b..5a11b08 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -26,6 +26,7 @@
     ":android.os.flags-aconfig-java{.generated_srcjars}",
     ":android.os.vibrator.flags-aconfig-java{.generated_srcjars}",
     ":android.security.flags-aconfig-java{.generated_srcjars}",
+    ":android.service.chooser.flags-aconfig-java{.generated_srcjars}",
     ":android.service.notification.flags-aconfig-java{.generated_srcjars}",
     ":android.view.flags-aconfig-java{.generated_srcjars}",
     ":android.view.accessibility.flags-aconfig-java{.generated_srcjars}",
@@ -666,6 +667,19 @@
     aconfig_declarations: "device_policy_aconfig_flags",
 }
 
+// Chooser / "Sharesheet"
+aconfig_declarations {
+    name: "android.service.chooser.flags-aconfig",
+    package: "android.service.chooser",
+    srcs: ["core/java/android/service/chooser/flags.aconfig"],
+}
+
+java_aconfig_library {
+    name: "android.service.chooser.flags-aconfig-java",
+    aconfig_declarations: "android.service.chooser.flags-aconfig",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}
+
 // JobScheduler
 aconfig_declarations {
     name: "framework-jobscheduler-job.flags-aconfig",