Ensure that delegate kernels have valid custom names

PiperOrigin-RevId: 239268129

tensorflow/lite/delegates/flex/kernel.cc

@@ -558,9 +558,16 @@ TfLiteStatus Eval(TfLiteContext* context, TfLiteNode* node) {
 }  // namespace kernel
 
 TfLiteRegistration GetKernel() {
-  TfLiteRegistration registration{&kernel::Init,    &kernel::Free,
-                                  &kernel::Prepare, &kernel::Eval,
-                                  nullptr,          kTfLiteBuiltinDelegate};
+  TfLiteRegistration registration{
+      &kernel::Init,
+      &kernel::Free,
+      &kernel::Prepare,
+      &kernel::Eval,
+      nullptr,                 // .profiling_string
+      kTfLiteBuiltinDelegate,  // .builtin_code
+      "TfLiteFlexDelegate",    // .custom_name
+      1,                       // .version
+  };
   return registration;
 }
 

tensorflow/lite/delegates/nnapi/nnapi_delegate.cc

@@ -1391,6 +1391,8 @@ TfLiteDelegate* NnApiDelegate() {
 
             .profiling_string = nullptr,
             .builtin_code = kTfLiteBuiltinDelegate,
+            .custom_name = "TfLiteNnapiDelegate",
+            .version = 1,
         };
 
         // Request TFLite to partition the graph and make kernels