[Bug 756211] Porting gst_video_sink_center_rect to gst_util_uint64_scale_int

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=756211

--- Comment #5 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
I was looking for real case examples of video_center_rect but I could not find
"strange" use cases.

But, I did add a simple profiling (after and before gst_util_get_timestamp ())
and compared the numbers with this patch.

Running this command 

$  LOOPS=100 CK_LOG_FILE_NAME=- CK_VERBOSITY=verbose CK_FORK=no
GST_CHECKS=test_video_center_rect make libs/video.torture

and getting an average, the current algorithm is slightly better than this
patch in my hardware (Haswell i7).

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