Add support for service configs to c-ares resolver.
diff --git a/BUILD b/BUILD
index 6b49973..83335da 100644
--- a/BUILD
+++ b/BUILD
@@ -593,6 +593,9 @@
         "src/core/lib/iomgr/ev_windows.c",
         "src/core/lib/iomgr/exec_ctx.c",
         "src/core/lib/iomgr/executor.c",
+        "src/core/lib/iomgr/gethostname_host_name_max.c",
+        "src/core/lib/iomgr/gethostname_sysconf.c",
+        "src/core/lib/iomgr/gethostname_fallback.c",
         "src/core/lib/iomgr/iocp_windows.c",
         "src/core/lib/iomgr/iomgr.c",
         "src/core/lib/iomgr/iomgr_posix.c",
@@ -718,6 +721,7 @@
         "src/core/lib/iomgr/ev_posix.h",
         "src/core/lib/iomgr/exec_ctx.h",
         "src/core/lib/iomgr/executor.h",
+        "src/core/lib/iomgr/gethostname.h",
         "src/core/lib/iomgr/iocp_windows.h",
         "src/core/lib/iomgr/iomgr.h",
         "src/core/lib/iomgr/iomgr_internal.h",