Add ENABLE_TRANSIENT_TASKBAR feature flag.

Bug: 252905206
Test: N/A
Change-Id: I7995e4fc0a181aee6932e0bee041b74a4241053e
diff --git a/src/com/android/launcher3/config/FeatureFlags.java b/src/com/android/launcher3/config/FeatureFlags.java
index 5ee5558..3a530af 100644
--- a/src/com/android/launcher3/config/FeatureFlags.java
+++ b/src/com/android/launcher3/config/FeatureFlags.java
@@ -297,6 +297,9 @@
             "SHOW_HOME_GARDENING", false,
             "Show the new home gardening mode");
 
+    public static final BooleanFlag ENABLE_TRANSIENT_TASKBAR = getDebugFlag(
+            "ENABLE_TRANSIENT_TASKBAR", false, "Enables transient taskbar.");
+
     public static void initialize(Context context) {
         synchronized (sDebugFlags) {
             for (DebugFlag flag : sDebugFlags) {