Create aconfig flag for bubble bar

Bug: 286246694
Test: make / treehugger
Change-Id: I8c4b2eacb7b1d8e9d6fdefd60e9eca5d7915cc5f
diff --git a/libs/WindowManager/Shell/aconfig/multitasking.aconfig b/libs/WindowManager/Shell/aconfig/multitasking.aconfig
index 2b95f30..9a66c0f 100644
--- a/libs/WindowManager/Shell/aconfig/multitasking.aconfig
+++ b/libs/WindowManager/Shell/aconfig/multitasking.aconfig
@@ -57,3 +57,10 @@
     description: "Enables new UMO experience for PiP menu"
     bug: "307998712"
 }
+
+flag {
+    name: "enable_bubble_bar"
+    namespace: "multitasking"
+    description: "Enables the new bubble bar UI for tablets"
+    bug: "286246694"
+}