Support swipe gesture on trackpad to swipe up from app

Bug: 254783214
Test: https://recall.googleplex.com/projects/3388b17c-d22f-46f8-b140-a102690377b4/sessions/92d385dd-bad5-49ea-a0b4-b4bf4010aabb
Change-Id: I74ba4a9e5c5096aaf6475f9cb8f1dc30de48024d
diff --git a/src/com/android/launcher3/config/FeatureFlags.java b/src/com/android/launcher3/config/FeatureFlags.java
index 05ba32a..4170e97 100644
--- a/src/com/android/launcher3/config/FeatureFlags.java
+++ b/src/com/android/launcher3/config/FeatureFlags.java
@@ -308,6 +308,9 @@
     public static final BooleanFlag ENABLE_TRANSIENT_TASKBAR = getDebugFlag(
             "ENABLE_TRANSIENT_TASKBAR", false, "Enables transient taskbar.");
 
+    public static final BooleanFlag ENABLE_TRACKPAD_GESTURE = getDebugFlag(
+            "ENABLE_TRACKPAD_GESTURE", false, "Enables trackpad gesture.");
+
     public static void initialize(Context context) {
         synchronized (sDebugFlags) {
             for (DebugFlag flag : sDebugFlags) {