Move IActivityTaskManager::getTasks binder call to background

Bug: 325041960
Flag: ACONFIG
Test: Maually tested

Change-Id: I6308fa367ee7bf2ef307ddaff733211ff29481a6
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index da06830..85bdb29 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -617,3 +617,14 @@
     description: "enables new focus outline for qs tiles when focused on with physical keyboard"
     bug: "312899524"
 }
+
+flag {
+   name: "edgeback_gesture_handler_get_running_tasks_background"
+    namespace: "systemui"
+    description: "Decide whether to get the running tasks from activity manager in EdgebackGestureHandler"
+        " class on the background thread."
+    bug: "325041960"
+    metadata {
+        purpose: PURPOSE_BUGFIX
+    }
+}