Add the right type conversions for various postMessage methods

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 319c762d4ddeda487d9c6998a33570179c27b2a2..6b1a7f794861630613961c7f26fee7504aaa236f 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -9535,7 +9535,7 @@ class DedicatedWorkerGlobalScope extends WorkerGlobalScope {
   @DomName('DedicatedWorkerGlobalScope.postMessage')
   @DocsEditable()
   @Experimental() // untriaged
-  void postMessage(Object message, [List<MessagePort> transfer]) => _blink.BlinkDedicatedWorkerGlobalScope.instance.postMessage_Callback_2_(unwrap_jso(this), message, transfer);
+  void postMessage(Object message, [List<MessagePort> transfer]) => _blink.BlinkDedicatedWorkerGlobalScope.instance.postMessage_Callback_2_(unwrap_jso(this), convertDartToNative_SerializedScriptValue(message), transfer);
   
   /// Stream of `message` events handled by this [DedicatedWorkerGlobalScope].
   @DomName('DedicatedWorkerGlobalScope.onmessage')
@@ -33019,7 +33019,7 @@ class ServiceWorkerClient extends DartHtmlDomObject {
   @DomName('ServiceWorkerClient.postMessage')
   @DocsEditable()
   @Experimental() // untriaged
-  void postMessage(/*SerializedScriptValue*/ message, [List<MessagePort> transfer]) => _blink.BlinkServiceWorkerClient.instance.postMessage_Callback_2_(unwrap_jso(this), message, transfer);
+  void postMessage(/*SerializedScriptValue*/ message, [List<MessagePort> transfer]) => _blink.BlinkServiceWorkerClient.instance.postMessage_Callback_2_(unwrap_jso(this), convertDartToNative_SerializedScriptValue(message), transfer);
   
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
@@ -40677,7 +40677,7 @@ class Worker extends EventTarget implements AbstractWorker {
 
   @DomName('Worker.postMessage')
   @DocsEditable()
-  void postMessage(/*SerializedScriptValue*/ message, [List<MessagePort> transfer]) => _blink.BlinkWorker.instance.postMessage_Callback_2_(unwrap_jso(this), message, transfer);
+  void postMessage(/*SerializedScriptValue*/ message, [List<MessagePort> transfer]) => _blink.BlinkWorker.instance.postMessage_Callback_2_(unwrap_jso(this), convertDartToNative_SerializedScriptValue(message), transfer);
   
   @DomName('Worker.terminate')
   @DocsEditable()