Add libgui bq_consumer_attach_callback flag

Add a flag for enabling IProducerListener callback when the consumer
attaches a buffer.

Bug: 353202582
Flag: EXEMPT adding flag
Test: n/a
Merged-In: I3268cb82fdc7d194f8b1864b8a72147ff51e3973
Change-Id: Ieaa25ed05d04a33de47de7ee3296e4bf1dde7a26
diff --git a/libs/gui/libgui_flags.aconfig b/libs/gui/libgui_flags.aconfig
index 792966f..87cef08 100644
--- a/libs/gui/libgui_flags.aconfig
+++ b/libs/gui/libgui_flags.aconfig
@@ -10,6 +10,14 @@
 } # bq_setframerate
 
 flag {
+  name: "bq_consumer_attach_callback"
+  namespace: "core_graphics"
+  description: "Controls IProducerListener to have consumer side attach callback"
+  bug: "353202582"
+  is_fixed_read_only: true
+} # bq_consumer_attach_callback
+
+flag {
   name: "frametimestamps_previousrelease"
   namespace: "core_graphics"
   description: "Controls a fence fixup for timestamp apis"