Update from https://crrev.com/308331

Fix ui/compositor/compositor.(h|cpp) based on http://crrev.com/738983002

Fix sky/engine based on current Blink code

R=qsr@chromium.org

Review URL: https://codereview.chromium.org/812543002
diff --git a/build/config/OWNERS b/build/config/OWNERS
index 9b79b9a..bd53091 100644
--- a/build/config/OWNERS
+++ b/build/config/OWNERS
@@ -1,2 +1,6 @@
-set noparent
 brettw@chromium.org
+dpranke@chromium.org
+scottmg@chromium.org
+
+per-file BUILDCONFIG.gn=brettw@chromium.org
+per-file BUILDCONFIG.gn=set noparent