Add flag for desktop windowing enter transitions

Bug: 369763947
Change-Id: Ica3d24e5fba440c754ca4da3888114298c45dd56
Test: na
Flag: EXEMPT adding flag
diff --git a/core/java/android/window/flags/lse_desktop_experience.aconfig b/core/java/android/window/flags/lse_desktop_experience.aconfig
index 155494f..1812953 100644
--- a/core/java/android/window/flags/lse_desktop_experience.aconfig
+++ b/core/java/android/window/flags/lse_desktop_experience.aconfig
@@ -239,6 +239,13 @@
 }
 
 flag {
+    name: "enable_desktop_windowing_enter_transitions"
+    namespace: "lse_desktop_experience"
+    description: "Enables enter desktop windowing transition & motion polish changes"
+    bug: "369763947"
+}
+
+flag {
     name: "enable_desktop_windowing_exit_transitions"
     namespace: "lse_desktop_experience"
     description: "Enables exit desktop windowing transition & motion polish changes"