Add aconfig flagging setup

Add the flagging configuration and build setup for the detailed app jank
metrics feature.

Bug: 364727734
Test: Manual build and verified flags available for use.
Flag: EXEMPT adding flag.
Change-Id: Ic4035376cc0552e0780323930c4777507bfa8db0
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index df4a3e5..0215951 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -24,6 +24,7 @@
         "android.app.appfunctions.flags-aconfig-java",
         "android.app.contextualsearch.flags-aconfig-java",
         "android.app.flags-aconfig-java",
+        "android.app.jank.flags-aconfig-java",
         "android.app.ondeviceintelligence-aconfig-java",
         "android.app.smartspace.flags-aconfig-java",
         "android.app.supervision.flags-aconfig-java",
@@ -1605,3 +1606,17 @@
     aconfig_declarations: "interaction_jank_monitor_flags",
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
+
+// App Jank
+aconfig_declarations {
+    name: "android.app.jank.flags-aconfig",
+    package: "android.app.jank",
+    container: "system",
+    srcs: ["core/java/android/app/jank/flags.aconfig"],
+}
+
+java_aconfig_library {
+    name: "android.app.jank.flags-aconfig-java",
+    aconfig_declarations: "android.app.jank.flags-aconfig",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}