Close KeyboardQuickSwitch if user taps outside the container.

Bug: 368119679
Change-Id: I3f0b1cacb76077daa5879ad93c195018948497f9
Test: open KQS via taskbar affordance, tap outside the container,
      observe KQS close
Flag: com.android.launcher3.taskbar_overflow

quickstep/src/com/android/launcher3/taskbar/KeyboardQuickSwitchViewController.java

@@ -21,6 +21,7 @@ import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.view.Gravity;
 import android.view.KeyEvent;
+import android.view.MotionEvent;
 import android.view.animation.AnimationUtils;
 import android.window.RemoteTransition;
 
@@ -31,6 +32,7 @@ import com.android.internal.jank.Cuj;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.anim.AnimatorListeners;
 import com.android.launcher3.taskbar.overlay.TaskbarOverlayContext;
+import com.android.launcher3.taskbar.overlay.TaskbarOverlayDragLayer;
 import com.android.launcher3.views.BaseDragLayer;
 import com.android.quickstep.SystemUiProxy;
 import com.android.quickstep.util.GroupTask;
@@ -236,6 +238,13 @@ public class KeyboardQuickSwitchViewController {
         pw.println(prefix + "\tmWasDesktopTaskFilteredOut=" + mWasDesktopTaskFilteredOut);
     }
 
+    /**
+     * @return True if the MotionEvent is over the {@link KeyboardQuickSwitchView}.
+     */
+    protected boolean isEventOverKeyboardQuickSwitch(TaskbarOverlayDragLayer dl, MotionEvent ev) {
+        return dl.isEventOverView(mKeyboardQuickSwitchView, ev);
+    }
+
     class ViewCallbacks {
 
         boolean onKeyUp(int keyCode, KeyEvent event, boolean isRTL, boolean allowTraversal) {