[Central Surfaces] Add flag for fetching bouncerShowing from diff place.

Bug: 285174336
Test: compiles
Change-Id: I9f8a6402733ab78162d3d5f7d8b19077197ecc57
Merged-In: I9f8a6402733ab78162d3d5f7d8b19077197ecc57
(cherry picked from commit 12f1c42723)

packages/SystemUI/src/com/android/systemui/flags/Flags.kt

@@ -748,4 +748,10 @@ object Flags {
     @JvmField
     val BIGPICTURE_NOTIFICATION_LAZY_LOADING =
             unreleasedFlag(283447257, "bigpicture_notification_lazy_loading")
+
+    // 2900 - CentralSurfaces-related flags
+
+    // TODO(b/285174336): Tracking Bug
+    @JvmField
+    val USE_REPOS_FOR_BOUNCER_SHOWING = unreleasedFlag(2900, "use_repos_for_bouncer_showing")
 }