Add missing include

Former-commit-id: a37c4fde2e

include/Kyoto/SObjectTag.hpp

@@ -0,0 +1,20 @@
+#ifndef __SOBJECTTAG_HPP__
+#define __SOBJECTTAG_HPP__
+
+#define kInvalidAssetId 0xFFFFFFFFu
+
+typedef uint CAssetId;
+typedef uint FourCC;
+
+struct SObjectTag {
+  FourCC type;
+  CAssetId id;
+
+  SObjectTag() {}
+  SObjectTag(FourCC type, CAssetId id) : type(type), id(id) {}
+  SObjectTag(const SObjectTag& other) : type(other.type), id(other.id) {}
+
+  static const char* Type2Text(FourCC type);
+};
+
+#endif