set zoom level with fit-page-width or fit-page-height in Java

User Story

As an application developer, I want to set PDF viewer zoom level wit fit-the-height or fit-the-width in Java so that I can implement a pre-defined application logic.

Acceptance Criteria

describe the final result from the owner's point of view to be counted as completed

Details

1. This should be most common requirement when setting zoom level. We should provide java API instead of js API.
current workaround

        Clients.response(new AuInvoke(pdfviewer, "_updateZoomDropdown", "fit-page-height"));
        Clients.response(new AuInvoke(pdfviewer, "_updateZoomFromSelect", "fit-page-height"));