Add support for 'nocompile' to IDL schema compiler.

tools/json_schema_compiler/test/idl_basics.idl

Index: tools/json_schema_compiler/test/idl_basics.idl
diff --git a/tools/json_schema_compiler/test/idl_basics.idl b/tools/json_schema_compiler/test/idl_basics.idl
index 7f0c3da47124dc1c15593cbe6d6a3e38438ec743..d85b5e2e5a5be6ea5c47cfc628ee42a793ee0f97 100644
--- a/tools/json_schema_compiler/test/idl_basics.idl
+++ b/tools/json_schema_compiler/test/idl_basics.idl
@@ -45,6 +45,10 @@ namespace idl_basics {
 
     static void function13(EnumType type, Callback5 cb);
     static void function14(EnumType[] types);
+
+    // "switch" is a reserved word and should cause a C++ compile error if we
+    // emit code for this declaration.
+    [nocompile] static void function15(long switch);
   };
 
   interface Events {