SF: add first trunk-stable flag

Bug: 297389311
Test: presubmit
Change-Id: I4c76676076779b4c641635bbecb9f77e0fdde51c
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index dc4e7cf..f752584 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -1450,6 +1450,8 @@
     void sfdo_setDebugFlash(int delay);
     void sfdo_scheduleComposite();
     void sfdo_scheduleCommit();
+
+    bool mMiscFlagValue;
 };
 
 class SurfaceComposerAIDL : public gui::BnSurfaceComposer {