eucan authored Aug 28, 2015 and Pekka Paalanen committed Oct 01, 2015

link_layer's sole purpose is to link a surface to multiple layers, if
the surface should be shown in multiple layers.  This can be only
achieved, if the surface has multiple weston_views with different
transformation matrices.

Current implementation assumes in many places that a ivi_surface has
only one weston_view.  Therefore, a surface can be only shown on one
layer.

Although this (a surface on multiple layers) is a nice to have feature
for ivi-shell, it is not very crucial.  In any case, it is not an easy
task to implement this feature, because it has lot of corner cases.

I removed with this patch the link_layer data structure, because it does
not have any purpose in current implementation.

Signed-off-by: Emre Ucan <eucan@de.adit-jv.com>
Tested-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
Reviewed-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
[Pekka: Line-wrapped the commit message.]