clutter/stage: Pass redraw clip instead of extents when painting view

That's the struct we have ready, the callee can just call
cairo_region_get_extents() if it only cares about the extents rectangle.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/1042

src/backends/meta-stage.c

@@ -209,15 +209,17 @@ meta_stage_paint (ClutterActor        *actor,
 }
 
 static void
-meta_stage_paint_view (ClutterStage     *stage,
-                       ClutterStageView *view)
+meta_stage_paint_view (ClutterStage         *stage,
+                       ClutterStageView     *view,
+                       const cairo_region_t *redraw_clip)
 {
   MetaStage *meta_stage = META_STAGE (stage);
 
   notify_watchers_for_mode (meta_stage, view, META_STAGE_WATCH_BEFORE_PAINT);
 
   meta_stage->current_view = view;
-  CLUTTER_STAGE_CLASS (meta_stage_parent_class)->paint_view (stage, view);
+  CLUTTER_STAGE_CLASS (meta_stage_parent_class)->paint_view (stage, view,
+                                                             redraw_clip);
 
   notify_watchers_for_mode (meta_stage, view, META_STAGE_WATCH_AFTER_PAINT);
 }

src/tests/clutter/conform/actor-shader-effect.c

@@ -232,6 +232,7 @@ get_pixel (CoglFramebuffer *fb,
 static void
 view_painted_cb (ClutterStage     *stage,
                  ClutterStageView *view,
+                 cairo_region_t   *redraw_clip,
                  gpointer          data)
 {
   CoglFramebuffer *fb = clutter_stage_view_get_framebuffer (view);