cc: Change tile manager perftest to use layers.

cc/test/impl_side_painting_settings.h

Index: cc/test/impl_side_painting_settings.h
diff --git a/cc/test/impl_side_painting_settings.h b/cc/test/impl_side_painting_settings.h
index 6929a484c87738aaf03254e01e3b60d86e6f0af3..1ea7e7837d7789b83eb1d6b66fbdf97962e0ee43 100644
--- a/cc/test/impl_side_painting_settings.h
+++ b/cc/test/impl_side_painting_settings.h
@@ -14,6 +14,11 @@ class ImplSidePaintingSettings : public LayerTreeSettings {
   ImplSidePaintingSettings() {
     impl_side_painting = true;
   }
+
+  explicit ImplSidePaintingSettings(int interest_rect_tiles) {
+    impl_side_painting = true;
+    max_tiles_for_interest_area = interest_rect_tiles;
+  }
 };
 
 }  // namespace cc