Reapply "Support toggling Taskbar All Apps with 3P Launcher." am: 036a83cd99

The revert was not supposed to be auto-merged.

This reverts commit 5a3bf93d82, reversing
changes made to 84f8002586.

Bug: 331384026
Change-Id: Ieb11a8544db90259aae856c4af805c37ce9e68cc

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

@@ -1560,4 +1560,13 @@ public class TaskbarActivityContext extends BaseTaskbarContext {
     public float getStashedTaskbarScale() {
         return mControllers.stashedHandleViewController.getStashedHandleHintScale().value;
     }
+
+    /** Closes the KeyboardQuickSwitchView without an animation if open. */
+    public void closeKeyboardQuickSwitchView() {
+        mControllers.keyboardQuickSwitchController.closeQuickSwitchView(false);
+    }
+
+    boolean canToggleHomeAllApps() {
+        return mControllers.uiController.canToggleHomeAllApps();
+    }
 }