Merge "Add synchronized check around async inflation callback" into main

        // Prevent multiple inflations for the same security mode. Instead, add callback to a list

        // and then notify each in order when the view is inflated.

        synchronized (mOnViewInflatedListeners) {

            mOnViewInflatedListeners.add(onViewInflatedCallback);

        }

        if (!mSecurityModeInProgress.contains(securityMode)) {

            mSecurityModeInProgress.add(securityMode);

            asynchronouslyInflateView(securityMode, keyguardSecurityCallback);

                        childController.init();

                        mChildren.add(childController);

                        for (OnViewInflatedCallback callback : mOnViewInflatedListeners) {

                        List<OnViewInflatedCallback> callbacks;

                        synchronized (mOnViewInflatedListeners) {

                            callbacks = new ArrayList<>(mOnViewInflatedListeners);

                            mOnViewInflatedListeners.clear();

                        }

                        for (OnViewInflatedCallback callback : callbacks) {

                            callback.onViewInflated(childController);

                        }

                        mOnViewInflatedListeners.clear();

                        // Single bouncer constrains are default

                        if (mFeatureFlags.isEnabled(LOCKSCREEN_ENABLE_LANDSCAPE)) {