Update from https://crrev.com/318214

TBR=qsr@chromium.org

Review URL: https://codereview.chromium.org/960873002
diff --git a/cc/BUILD.gn b/cc/BUILD.gn
index cffee57..c29cda8 100644
--- a/cc/BUILD.gn
+++ b/cc/BUILD.gn
@@ -337,6 +337,8 @@
     "resources/clip_display_item.h",
     "resources/clip_path_display_item.cc",
     "resources/clip_path_display_item.h",
+    "resources/compositing_display_item.cc",
+    "resources/compositing_display_item.h",
     "resources/content_layer_updater.cc",
     "resources/content_layer_updater.h",
     "resources/display_item.cc",
@@ -466,8 +468,6 @@
     "resources/transferable_resource.h",
     "resources/transform_display_item.cc",
     "resources/transform_display_item.h",
-    "resources/transparency_display_item.cc",
-    "resources/transparency_display_item.h",
     "resources/ui_resource_bitmap.cc",
     "resources/ui_resource_bitmap.h",
     "resources/ui_resource_client.h",