[Bug 796541] waylandsink: support video crop using viewporter protocol

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796541

--- Comment #5 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Nicolas Dufresne (ndufresne) from comment #4)
> Review of attachment 372605 [details] [review]:
> 
> Ok, looks ok in general, please make a better commit message, and also
> update propose_allocation() as right now, if you receive a crop meta on a
> buffer it means up have a bug in your upstream element. Upstream element
> should only attach crop meta if the allocation query contains
> GST_VIDEO_CROP_META_API_TYPE

Ok， thanks. I will update this commit message and refine my code

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