Add bug fix flag for inset update seq

Bug: 339380439
Test: flag only
Change-Id: I49e4107b2ae43898664dd4ccb48ffc6090413a2f

core/java/android/window/flags/windowing_sdk.aconfig

@@ -147,4 +147,15 @@ flag {
     metadata {
         purpose: PURPOSE_BUGFIX
     }
+}
+
+flag {
+    namespace: "windowing_sdk"
+    name: "insets_control_seq"
+    description: "Add seqId to InsetsControls to ensure the stale update is ignored"
+    bug: "339380439"
+    is_fixed_read_only: true
+    metadata {
+        purpose: PURPOSE_BUGFIX
+    }
 }
\ No newline at end of file