Add flag for HDR screenshots

Bug: 329470026
Flag: com.android.graphics.surfaceflinger.flags.true_hdr_screenshots
Test: builds
Change-Id: I13650b4433ab062b7f5f67005c0948b417c1f269
diff --git a/services/surfaceflinger/surfaceflinger_flags_new.aconfig b/services/surfaceflinger/surfaceflinger_flags_new.aconfig
index 886167e..0ff846e7 100644
--- a/services/surfaceflinger/surfaceflinger_flags_new.aconfig
+++ b/services/surfaceflinger/surfaceflinger_flags_new.aconfig
@@ -114,6 +114,14 @@
   }
  } # single_hop_screenshot
 
+flag {
+    name: "true_hdr_screenshots"
+    namespace: "core_graphics"
+    description: "Enables screenshotting display content in HDR, sans tone mapping"
+    bug: "329470026"
+    is_fixed_read_only: true
+} # true_hdr_screenshots
+
  flag {
   name: "override_trusted_overlay"
   namespace: "window_surfaces"