Add interface versioning. Methods queryVersion and requireVersion.

mojo/public/js/constants.cc

Index: mojo/public/js/constants.cc
diff --git a/mojo/public/js/constants.cc b/mojo/public/js/constants.cc
index 7c7b64e4198df2c4405416f0e86ecc9cae9b7a4e..60a1f395da15c8318ab3f5583520959754f57850 100644
--- a/mojo/public/js/constants.cc
+++ b/mojo/public/js/constants.cc
@@ -14,5 +14,10 @@ const char kInterfaceTypesModuleName[] = "mojo/public/js/interface_types";
 const char kRouterModuleName[] = "mojo/public/js/router";
 const char kUnicodeModuleName[] = "mojo/public/js/unicode";
 const char kValidatorModuleName[] = "mojo/public/js/validator";
-
+const char kControlMessageProxyModuleName[] =
+    "mojo/public/js/lib/control_message_proxy";
+const char kControlMessageHandlerModuleName[] =
+    "mojo/public/js/lib/control_message_handler";
+const char kInterfaceControlMessagesMojom[] =
+    "mojo/public/interfaces/bindings/interface_control_messages.mojom";
 }  // namespace mojo