Add aconfig feature flag for expressive theme in Gesture nav and Taskbar

Test: Presubmit
Fix: 394613212
Flag: com.android.launcher3.expressive_theme_in_taskbar_and_navigation
Change-Id: I73ad79719d255953e75445209fa92c587356a47b
diff --git a/aconfig/launcher.aconfig b/aconfig/launcher.aconfig
index b70490b..9fa2f50 100644
--- a/aconfig/launcher.aconfig
+++ b/aconfig/launcher.aconfig
@@ -591,3 +591,13 @@
   description: "Enable Alt + Tab KQS support on connected displays"
   bug: "394007677"
 }
+
+flag {
+  name: "expressive_theme_in_taskbar_and_navigation"
+  namespace: "launcher"
+  description: "Enables the expressive theme and GSF font styles for Taskbar and Gesture Navigation"
+  bug: "394613212"
+  metadata {
+    purpose: PURPOSE_BUGFIX
+  }
+}