Merge "Annotate shell_transit flag as Keep" into tm-dev am: 288ba245e3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17129191

Change-Id: Ib888fe44d3689c3aafa42665b2a2527a25c3e131

packages/SystemUI/src/com/android/systemui/flags/Flags.java

@@ -16,6 +16,7 @@
 
 package com.android.systemui.flags;
 
+import com.android.internal.annotations.Keep;
 import com.android.systemui.R;
 
 import java.lang.reflect.Field;
@@ -154,6 +155,7 @@ public class Flags {
             new BooleanFlag(1000, true);
 
     // 1100 - windowing
+    @Keep
     public static final SysPropBooleanFlag WM_ENABLE_SHELL_TRANSITIONS =
             new SysPropBooleanFlag(1100, "persist.wm.debug.shell_transit", false);