Refactor InferenceCalculatorWebNn to use InferenceRunnerLiteRt.

LiteRT-PiperOrigin-RevId: 820329122

Author: ai-edge-bot

litert/c/litert_options.cc

@@ -47,7 +47,11 @@ LiteRtStatus LiteRtSetOptionsHardwareAccelerators(
   LRT_CHECK_NON_NULL(options);
   if ((hardware_accelerators &
        (kLiteRtHwAcceleratorCpu | kLiteRtHwAcceleratorGpu |
-        kLiteRtHwAcceleratorNpu)) != hardware_accelerators) {
+        kLiteRtHwAcceleratorNpu
+#ifdef __EMSCRIPTEN__
+        | kLiteRtHwAcceleratorWebNn
+#endif  // __EMSCRIPTEN__
+        )) != hardware_accelerators) {
     LITERT_LOG(LITERT_ERROR,
                "Invalid bitfield value for hardware accelerator set: %d.",
                hardware_accelerators);

litert/runtime/compiled_model.cc

@@ -187,6 +187,15 @@ Expected<void> LiteRtCompiledModelT::InitializeRuntime(
       resolver.AddCustom(op_name, &sStubRegistration);
     }
   }
+  #ifdef __EMSCRIPTEN__
+  else if (hardware_accelerators & kLiteRtHwAcceleratorWebNn) {
+    const char* accelerator_supported_custom_ops[] = {
+        "Convolution2DTransposeBias"};
+    for (const auto& op_name : accelerator_supported_custom_ops) {
+      resolver.AddCustom(op_name, &sStubRegistration);
+    }
+  }
+#endif  // __EMSCRIPTEN__
 
   tflite::InterpreterOptions interpreter_options;
   interpreter_options.SetUseSignatureTensorNames(true);