Merge "Return compat callback for apps requesting legacy back."

        synchronized (task.mWmService.mGlobalLock) {

            activityRecord = task.topRunningActivity();

            if(!activityRecord.info.applicationInfo.isOnBackInvokedCallbackEnabled()) {

                ProtoLog.d(WM_DEBUG_BACK_PREVIEW, "Activity %s: enableOnBackInvokedCallback=false."

                        + " Returning null BackNavigationInfo.", activityRecord.getName());

                return null;

            }

            removedWindowContainer = activityRecord;

            taskWindowConfiguration = task.getTaskInfo().configuration.windowConfiguration;

            WindowState window = task.getWindow(WindowState::isFocused);