Raster display item lists via a visual rect RTree.

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index a68cb02d91e60294f92872dfaced4d70c09d4415..6bef1ada6bf3348d93b7bd13ac52229acae408ff 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -1579,7 +1579,7 @@ class TestOpacityChangeLayerDelegate : public ContentLayerClient {
 
     // Return a dummy display list.
     scoped_refptr<DisplayItemList> display_list =
-        DisplayItemList::Create(PaintableRegion(), DisplayItemListSettings());
+        DisplayItemList::Create(DisplayItemListSettings());
     return display_list;
   }
   bool FillsBoundsCompletely() const override { return false; }
@@ -2184,7 +2184,7 @@ class LayerTreeHostTestChangeLayerPropertiesInPaintContents
 
       // Return a dummy display list.
       scoped_refptr<DisplayItemList> display_list =
-          DisplayItemList::Create(PaintableRegion(), DisplayItemListSettings());
+          DisplayItemList::Create(DisplayItemListSettings());
       return display_list;
     }