Merge pull request #45 from aiuto/crhm

Add chromiumos
diff --git a/os/BUILD b/os/BUILD
index 96df162..e0484ee 100644
--- a/os/BUILD
+++ b/os/BUILD
@@ -106,3 +106,8 @@
     name = "fuchsia",
     constraint_setting = ":os",
 )
+
+constraint_value(
+    name = "chromiumos",
+    constraint_setting = ":os",
+)