add owners file for tools/run_tests/
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index fb6f98c..9dc2a1a 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -6,4 +6,6 @@
 /cmake/** @jtattermusch @nicolasnoble @matt-kwong
 /src/core/ext/filters/client_channel/** @markdroth @dgquintas @a11r
 /tools/dockerfile/** @jtattermusch @matt-kwong @nicolasnoble
+/tools/run_tests/** @jtattermusch @matt-kwong @dgquintas
+/tools/run_tests/generated/** @grpc/grpc-team
 /tools/run_tests/performance/** @ncteisen @matt-kwong @jtattermusch