ecore-wl: Optimize opaque region setting for surface and reduce

ecore-wl: Optimize opaque region setting for surface and reduce
unnecessary calls to surface commit.

@bugfix: We don't need to call surface_commit if we are just setting
the opaque (or input) region(s). This reduces some overhead on the
compositor side (and thus reduces useless redraws). Also, optimize
opaque_region_set to not Reset to the same region; we do this by
storing the opaque region into the window structure, and on calls to
opaque_region_set we can compare those values and not re-apply the
same opaque region.

Signed-off-by: Chris Michael <cp.michael@samsung.com>