Move to a separate method

Author: Emmanuel Garcia

runtime/dart_isolate.cc

@@ -725,6 +725,32 @@ bool DartIsolate::MarkIsolateRunnable() {
   return true;
 }
 
+[[nodiscard]] static void InvokeDartPluginRegistrantIfAvailable(
+    Dart_Handle library_handle) {
+  TRACE_EVENT0("flutter", "InvokeDartPluginRegistrantIfAvailable");
+
+  // The Dart plugin registrant is a static with signature `void register()`
+  // within the class `_PluginRegistrant` generated by the Flutter tool.
+  //
+  // This method binds a plugin implementation to their platform
+  // interface based on the configuration of the app's pubpec.yaml, and the
+  // plugin's pubspec.yaml.
+  //
+  // Since this method may or may not be defined, check if the class is defined
+  // in the default library before calling the method.
+  Dart_Handle plugin_registrant =
+      ::Dart_GetClass(library_handle, tonic::ToDart("_PluginRegistrant"));
+
+  if (Dart_IsError(plugin_registrant)) {
+    return;
+  }
+  Dart_Handle result =
+      tonic::DartInvokeField(plugin_registrant, "register", {});
+  if (tonic::LogIfError(result)) {
+    FML_LOG(ERROR) << "The Dart plugin registrant produced an error";
+  }
+}
+
 bool DartIsolate::RunFromLibrary(std::optional<std::string> library_name,
                                  std::optional<std::string> entrypoint,
                                  const std::vector<std::string>& args) {
@@ -746,25 +772,7 @@ bool DartIsolate::RunFromLibrary(std::optional<std::string> library_name,
   auto user_entrypoint_function =
       ::Dart_GetField(library_handle, entrypoint_handle);
 
-  // The Dart plugin registrant is a static with signature `void register()`
-  // within the class `_PluginRegistrant` generated by the Flutter tool.
-  //
-  // This method binds a plugin implementation to their platform
-  // interface based on the configuration of the app's pubpec.yaml, and the
-  // plugin's pubspec.yaml.
-  //
-  // Since this method may or may not be defined, check if the class is defined
-  // in the default library before calling the method.
-  Dart_Handle plugin_registrant =
-      ::Dart_GetClass(library_handle, tonic::ToDart("_PluginRegistrant"));
-
-  if (!Dart_IsError(plugin_registrant)) {
-    Dart_Handle result =
-        tonic::DartInvokeField(plugin_registrant, "register", {});
-    if (tonic::LogIfError(result)) {
-      FML_LOG(ERROR) << "Could not invoke the Dart plugin registrant.";
-    }
-  }
+  InvokeDartPluginRegistrantIfAvailable(library_handle);
 
   if (!InvokeMainEntrypoint(user_entrypoint_function, entrypoint_args)) {
     return false;