Add ENABLE_TOAST_IMPRESSION_LOGGING to FeatureFlags.

Bug: 204781396
Test: Manual
Change-Id: Icd1170d8fc349ca3a50836ef0d1d0c9a0c793002
diff --git a/src/com/android/launcher3/config/FeatureFlags.java b/src/com/android/launcher3/config/FeatureFlags.java
index 4287779..3a58020 100644
--- a/src/com/android/launcher3/config/FeatureFlags.java
+++ b/src/com/android/launcher3/config/FeatureFlags.java
@@ -323,6 +323,9 @@
     public static final BooleanFlag SHOW_DOT_PAGINATION = getDebugFlag(
             "SHOW_DOT_PAGINATION", false, "Enable showing dot pagination in workspace");
 
+    public static final BooleanFlag ENABLE_TOAST_IMPRESSION_LOGGING = getDebugFlag(
+            "ENABLE_TOAST_IMPRESSION_LOGGING", false, "Enable toast impression logging");
+
     public static void initialize(Context context) {
         synchronized (sDebugFlags) {
             for (DebugFlag flag : sDebugFlags) {