wayland: Make the surface actor set its own state

Since the surface actor knows more about how it draws itself, instead of
pushing texture state (buffer and scale), input region and opaque region
from MetaWaylandSurface after having transformed into what the surface
actor expects, make the surface actor set its own state given what state
the Wayland surface is in.

https://bugzilla.gnome.org/show_bug.cgi?id=744933

src/wayland/meta-wayland-surface.h

@@ -81,6 +81,8 @@ struct _MetaWaylandSurface
   MetaWindow *window;
   MetaWaylandBuffer *buffer;
   struct wl_listener buffer_destroy_listener;
+  cairo_region_t *input_region;
+  cairo_region_t *opaque_region;
   int scale;
   int32_t offset_x, offset_y;
   GList *subsurfaces;