Add flag for visual interruptions refactor

Bug: 261728888
Test: presubmit
Flag: ACONFIG com.android.systemui.visual_interruptions_refactor DEVELOPMENT
Change-Id: I90b51ec94d3b0be452a78d41b7feff344b2cfb12
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index c26d5f5..8eff9bf 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -51,3 +51,11 @@
     description: "Enables the scene container framework go/flexiglass."
     bug: "283121968"
 }
+
+flag {
+    name: "visual_interruptions_refactor"
+    namespace: "systemui"
+    description: "Enables the refactored version of the code to decide when notifications "
+        "HUN, bubble, pulse, or FSI."
+    bug: "261728888"
+}