Add enum class support to json_schema_compiler (idl files)

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 bfa49dce7f41e1d46bb5432bb8a9ca8676011108..b8daa200076df39f254a491305a7cf6c543c9d6b 100644
--- a/tools/json_schema_compiler/test/idl_basics.idl
+++ b/tools/json_schema_compiler/test/idl_basics.idl
@@ -17,6 +17,21 @@
     name2
   };
 
+  [cpp_enum_prefix_override="prefix"] enum EnumWithPrefix {
+    name1,
+    name2
+  };
+
+  [enum_class] enum EnumClass {
+    name1,
+    name2
+  };
+
+  [enum_class,cpp_enum_prefix_override="prefix"] enum EnumClassWithPrefix {
+    name1,
+    name2
+  };
+
   dictionary MyType1 {
     // This comment tests "double-quotes".
     [legalValues=(1,2)] long x;
@@ -31,6 +46,13 @@
     DOMString x;
   };
 
+  dictionary MyType3 {
+    EnumType w;
+    EnumWithPrefix x;
+    EnumClass y;
+    EnumClassWithPrefix z;
+  };
+
   dictionary UnionType {
     (EnumType or DOMString)? x;
     (DOMString or EnumType) y;