Add flag for launcher contrast tile

Bug: 341217082
Flag: EXEMPT adding flag
Test: EXEMPT adding flag
Change-Id: I13720e037e51d33541012f5dcb49306284ea8899
diff --git a/aconfig/launcher.aconfig b/aconfig/launcher.aconfig
index d334cf4..949acc1 100644
--- a/aconfig/launcher.aconfig
+++ b/aconfig/launcher.aconfig
@@ -499,3 +499,10 @@
    description: "Enforce system radius for widget corners instead of a separate 16.dp value"
    bug: "370950552"
 }
+
+flag {
+    name: "enable_contrast_tiles"
+    namespace: "launcher"
+    description: "Enable launcher app contrast tiles."
+    bug: "341217082"
+}