SF: Add a sysprop for game default frame rate

Bug: 286084594
Test: SurfaceFlinger unit tests
Change-Id: Icc3ed7642e45c8c28b063cbe1799e09c00a05e35
diff --git a/services/surfaceflinger/SurfaceFlingerProperties.h b/services/surfaceflinger/SurfaceFlingerProperties.h
index a080420..65ebe2a 100644
--- a/services/surfaceflinger/SurfaceFlingerProperties.h
+++ b/services/surfaceflinger/SurfaceFlingerProperties.h
@@ -101,6 +101,8 @@
 
 bool clear_slots_with_set_layer_buffer(bool defaultValue);
 
+int32_t game_default_frame_rate_override(int32_t defaultValue);
+
 } // namespace sysprop
 } // namespace android
 #endif // SURFACEFLINGERPROPERTIES_H_