VideoEditor:IssueID:3396697: Added Preview Test code

This has dependency on Ide5ee82b24806a52b4e612db4bc3c34f75e4465a
Removed trailing space in xml file
Removed dependency on test cases other than Preview & API

Change-Id: I835c0ca17d6ff15819407eb930cca8a08b095287
4 files changed