Add ADPF GPU impl flag for SurfaceFlinger

Bug: 284324521
Test: atest FlagManagerTest
Change-Id: Iaa137969d00aa5cfd50b3c647cdd836e09b9d63e
diff --git a/services/surfaceflinger/common/FlagManager.cpp b/services/surfaceflinger/common/FlagManager.cpp
index 3c2ccbc..6aa7f7a 100644
--- a/services/surfaceflinger/common/FlagManager.cpp
+++ b/services/surfaceflinger/common/FlagManager.cpp
@@ -110,6 +110,7 @@
 
     /// Trunk stable server flags ///
     DUMP_SERVER_FLAG(refresh_rate_overlay_on_external_display);
+    DUMP_SERVER_FLAG(adpf_gpu_sf);
     DUMP_SERVER_FLAG(adpf_use_fmq_channel);
 
     /// Trunk stable readonly flags ///
@@ -220,6 +221,7 @@
 
 /// Trunk stable server flags ///
 FLAG_MANAGER_SERVER_FLAG(refresh_rate_overlay_on_external_display, "")
+FLAG_MANAGER_SERVER_FLAG(adpf_gpu_sf, "")
 
 /// Trunk stable server flags from outside SurfaceFlinger ///
 FLAG_MANAGER_SERVER_FLAG_IMPORTED(adpf_use_fmq_channel, "", android::os)