Immediately close taskbar all apps on swipe up gesture.

Test: Manual
Fix: 219981339
Change-Id: I306a8aa1c55464718a1318f87007d68c383e461e

quickstep/src/com/android/launcher3/taskbar/allapps/TaskbarAllAppsController.java

@@ -131,6 +131,11 @@ public final class TaskbarAllAppsController implements OnDeviceProfileChangeList
                 .setPredictedApps(mPredictedApps);
     }
 
+    /** Closes the {@link TaskbarAllAppsContainerView}. */
+    public void hide() {
+        mProxyView.close(true);
+    }
+
     /**
      * Removes the all apps window from the hierarchy, if all floating views are closed and there is
      * no system drag operation in progress.