PDF Viewer Missing Design Dialog

[HitmanInWis]

As a standard in WCM Core, all components have a design dialog with at least a "Styles" tab for the AEM Style System. The PDF Viewer component, though it has a Styles tab on it's editor dialog (cq:dialog), is missing a cq:design_dialog, preventing Content Policies for this component to be created and Styles to be defined.

A default design dialog should be added to this component, supporting the Styles tab if nothing else.