Merge "[Predictive Back] Gate feature under experiment flag" into udc-dev am: 9529f08b1b am: 703f54a9d1

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/22363525

Change-Id: I6a722915f8c5aff400c6d2cbd747b9c0edae1441
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java

@@ -745,6 +745,10 @@ public class QuickstepLauncher extends Launcher {
 
     @Override
     protected void registerBackDispatcher() {
+        if (!FeatureFlags.ENABLE_BACK_SWIPE_LAUNCHER_ANIMATION.get()) {
+            super.registerBackDispatcher();
+            return;
+        }
         getOnBackInvokedDispatcher().registerOnBackInvokedCallback(
                 OnBackInvokedDispatcher.PRIORITY_DEFAULT,
                 new OnBackAnimationCallback() {