Adding aconfig setup for multitasking

Bug: 300136750
Test: Builds
Change-Id: I1532447f94c6ea35344207d6df9469703c890ce5
diff --git a/libs/WindowManager/Shell/aconfig/Android.bp b/libs/WindowManager/Shell/aconfig/Android.bp
new file mode 100644
index 0000000..1a98ffc
--- /dev/null
+++ b/libs/WindowManager/Shell/aconfig/Android.bp
@@ -0,0 +1,12 @@
+aconfig_declarations {
+    name: "com_android_wm_shell_flags",
+    package: "com.android.wm.shell",
+    srcs: [
+        "multitasking.aconfig",
+    ],
+}
+
+java_aconfig_library {
+    name: "com_android_wm_shell_flags_lib",
+    aconfig_declarations: "com_android_wm_shell_flags",
+}
\ No newline at end of file