Taskbar System Action with Broadcast Receiver.

Test: Manual
Bug: 265618836
Change-Id: I734402ef277a09cf5e41aa63f8be09375706c17a

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

@@ -263,6 +263,13 @@ public class TaskbarActivityContext extends BaseTaskbarContext {
         }
     }
 
+    /**
+     * Show Taskbar upon receiving broadcast
+     */
+    public void showTaskbarFromBroadcast() {
+        mControllers.taskbarStashController.showTaskbarFromBroadcast();
+    }
+
     @Override
     public DeviceProfile getDeviceProfile() {
         return mDeviceProfile;