Add a flag for multithreaded present

Bug: 259132483
Test: presubmit
Change-Id: I4fb618487f0a2895bd8f41aca7e3e44f0b1816ec
diff --git a/services/surfaceflinger/surfaceflinger_flags.aconfig b/services/surfaceflinger/surfaceflinger_flags.aconfig
index becbb87..5a277bd 100644
--- a/services/surfaceflinger/surfaceflinger_flags.aconfig
+++ b/services/surfaceflinger/surfaceflinger_flags.aconfig
@@ -45,3 +45,11 @@
   description: "This flag is guarding the behaviour where SurfaceFlinger is trying to opportunistically present a frame when the configuration change from late to early"
   bug: "273702768"
 }
+
+flag {
+  name: "multithreaded_present"
+  namespace: "core_graphics"
+  description: "Controls whether to offload present calls to another thread"
+  bug: "259132483"
+  is_fixed_read_only: true
+}