kernel: Add basic support for Domain object.

src/core/hle/kernel/kernel.h

@@ -31,6 +31,7 @@ enum class HandleType : u32 {
     ServerPort,
     ClientSession,
     ServerSession,
+    Domain,
 };
 
 enum {
@@ -83,12 +84,28 @@ public:
         case HandleType::CodeSet:
         case HandleType::ClientPort:
         case HandleType::ClientSession:
+        case HandleType::Domain:
             return false;
         }
 
         UNREACHABLE();
     }
 
+    /**
+     * Check if svcSendSyncRequest can be called on the object
+     * @return True svcSendSyncRequest can be called on the object, otherwise false
+     */
+    bool IsSyncable() const {
+        switch (GetHandleType()) {
+        case HandleType::ClientSession:
+        case HandleType::Domain:
+            return true;
+        }
+
+        UNREACHABLE();
+    }
+
+
 public:
     static unsigned int next_object_id;