Add feature flag for enable_separate_external_display_tasks

Bug: 391311008
Flag: com.android.launcher3.enable_separate_external_display_tasks
Test: None
Change-Id: Iae86c73912bbe5ba8c0736d2631eebcfd2f8620a
diff --git a/aconfig/launcher_overview.aconfig b/aconfig/launcher_overview.aconfig
index e0a597c..5f082db 100644
--- a/aconfig/launcher_overview.aconfig
+++ b/aconfig/launcher_overview.aconfig
@@ -79,3 +79,13 @@
     description: "Enables expressive motion and animations for dismissing a task in Overview."
     bug: "381239462"
 }
+
+flag {
+    name: "enable_separate_external_display_tasks"
+    namespace: "launcher_overview"
+    description: "Enables separating external display tasks in Overview."
+    bug: "391311008"
+    metadata {
+      purpose: PURPOSE_BUGFIX
+    }
+}