TaskbarManager now sets TaskbarUIController for RecentsWindowManager

- FallbackTaskbarUIController can take in a generic
  RecentsViewContainer parameter, i.e. RecentsActivity or
  RecentsWindowManager.
- When changing Overview targets to RecentsWindowManager, which is not
  an Activity, we still update the TaskbarUIController

Test: Switch between default Home activities with the flag on and off,
ensure Taskbar works as expected in each case (3P vs 1P launcher).
Flag: com.android.launcher3.enable_fallback_overview_in_window
Fixes: 368030750
Fixes: 365775636

Change-Id: Ife775e8c226f8c73ec9e1f97b4a6f2972f6c905f

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

@@ -139,6 +139,7 @@ import com.android.launcher3.statemanager.StateManager.AtomicAnimationFactory;
 import com.android.launcher3.statemanager.StateManager.StateHandler;
 import com.android.launcher3.taskbar.LauncherTaskbarUIController;
 import com.android.launcher3.taskbar.TaskbarManager;
+import com.android.launcher3.taskbar.TaskbarUIController;
 import com.android.launcher3.testing.TestLogging;
 import com.android.launcher3.testing.shared.TestProtocol;
 import com.android.launcher3.uioverrides.QuickstepWidgetHolder.QuickstepHolderFactory;
@@ -1089,10 +1090,12 @@ public class QuickstepLauncher extends Launcher implements RecentsViewContainer,
         );
     }
 
-    public void setTaskbarUIController(LauncherTaskbarUIController taskbarUIController) {
-        mTaskbarUIController = taskbarUIController;
+    @Override
+    public void setTaskbarUIController(@Nullable TaskbarUIController taskbarUIController) {
+        mTaskbarUIController = (LauncherTaskbarUIController) taskbarUIController;
     }
 
+    @Override
     public @Nullable LauncherTaskbarUIController getTaskbarUIController() {
         return mTaskbarUIController;
     }
@@ -1399,6 +1402,7 @@ public class QuickstepLauncher extends Launcher implements RecentsViewContainer,
     }
 
     @NonNull
+    @Override
     public TISBindHelper getTISBindHelper() {
         return mTISBindHelper;
     }