Add flag for setFrameRate API

Bug: 356987016
Test: presubmits, local config test
Flag: com.android.graphics.surfaceflinger.flags.arr_setframerate_api

Change-Id: If0856aea1277c5e05921138de7a1c12a95cb3f46
diff --git a/services/surfaceflinger/surfaceflinger_flags_new.aconfig b/services/surfaceflinger/surfaceflinger_flags_new.aconfig
index 102e2b6..e40be51 100644
--- a/services/surfaceflinger/surfaceflinger_flags_new.aconfig
+++ b/services/surfaceflinger/surfaceflinger_flags_new.aconfig
@@ -11,6 +11,14 @@
 } # adpf_gpu_sf
 
 flag {
+  name: "arr_setframerate_api"
+  namespace: "core_graphics"
+  description: "New setFrameRate API for Android 16"
+  bug: "356987016"
+  is_fixed_read_only: true
+} # arr_setframerate_api
+
+flag {
   name: "ce_fence_promise"
   namespace: "window_surfaces"
   description: "Moves logic for buffer release fences into LayerFE"