Opt-in predicitive back before register the back button

The predictive back infra checks the opt-in status when a callback is registered, and drops the registration if the Application / Activity is not opted-in

Fix: 326627953
Test: manual
Flag: ACONFIG launcher.enable_predictive_back_gesture DISABLED
Change-Id: I8f2e2378d0bf966b3784cf08c12045509b6d5682

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

@@ -647,10 +647,13 @@ public class QuickstepLauncher extends Launcher {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
+        // Back dispatcher is registered in {@link BaseActivity#onCreate}. For predictive back to
+        // work, we must opt-in BEFORE registering back dispatcher. So we need to call
+        // setEnableOnBackInvokedCallback() before super.onCreate()
         if (Utilities.ATLEAST_U && enablePredictiveBackGesture()) {
             getApplicationInfo().setEnableOnBackInvokedCallback(true);
         }
+        super.onCreate(savedInstanceState);
         if (savedInstanceState != null) {
             mPendingSplitSelectInfo = ObjectWrapper.unwrap(
                     savedInstanceState.getIBinder(PENDING_SPLIT_SELECT_INFO));