SF: Adding sysprop flag for video detection

The flag will be turned on in a new CL.

Test: manual
Bug: 126272046

Change-Id: Ie15c0abbde641a731616cf94b076e43feafe7bc7
diff --git a/services/surfaceflinger/SurfaceFlingerProperties.h b/services/surfaceflinger/SurfaceFlingerProperties.h
index 0199d79..6f90117 100644
--- a/services/surfaceflinger/SurfaceFlingerProperties.h
+++ b/services/surfaceflinger/SurfaceFlingerProperties.h
@@ -57,6 +57,8 @@
 
 int32_t set_idle_timer_ms(int32_t defaultValue);
 
+bool use_smart_90_for_video(bool defaultValue);
+
 android::ui::DisplayPrimaries getDisplayNativePrimaries();
 } // namespace sysprop
 } // namespace android