Flag: Add a trunk-stable flag to guard EDID-based Display IDs

Add a trunk-stable flag to guard the use of EDID-based display IDs.

See: go/edid-display-ids-al13

Flag: com.android.graphics.surfaceflinger.flags.stable_edid_ids
Bug: 352320847
Test: None.
Change-Id: Ifc59d031faeb19aedf5eccc68a1c9a5d0f538122
diff --git a/services/surfaceflinger/surfaceflinger_flags_new.aconfig b/services/surfaceflinger/surfaceflinger_flags_new.aconfig
index 6903941..d4250bc 100644
--- a/services/surfaceflinger/surfaceflinger_flags_new.aconfig
+++ b/services/surfaceflinger/surfaceflinger_flags_new.aconfig
@@ -207,6 +207,14 @@
  } # skip_invisible_windows_in_input
 
 flag {
+  name: "stable_edid_ids"
+  namespace: "core_graphics"
+  description: "Guard use of the new stable EDID-based display IDs system."
+  bug: "352320847"
+  is_fixed_read_only: true
+} # stable_edid_ids
+
+flag {
   name: "true_hdr_screenshots"
   namespace: "core_graphics"
   description: "Enables screenshotting display content in HDR, sans tone mapping"