Implement the plumbing to handle messages in a separate handler

android_webview/native/aw_message_port_service_impl.cc

Index: android_webview/native/aw_message_port_service_impl.cc
diff --git a/android_webview/native/aw_message_port_service_impl.cc b/android_webview/native/aw_message_port_service_impl.cc
index b4bf2ca61f9108a96bc05e59288ba6d0c600480f..0a15d9f44ef8ccc1e8bb24b01c2961124d1a7b4a 100644
--- a/android_webview/native/aw_message_port_service_impl.cc
+++ b/android_webview/native/aw_message_port_service_impl.cc
@@ -98,11 +98,11 @@ void AwMessagePortServiceImpl::OnConvertedWebToAppMessage(
   ScopedJavaLocalRef<jstring> jmsg = ConvertUTF16ToJavaString(env, value);
   ScopedJavaLocalRef<jintArray> jports =
       ToJavaIntArray(env, sent_message_port_ids);
-  Java_AwMessagePortService_onPostMessage(env,
-                                          jobj.obj(),
-                                          message_port_id,
-                                          jmsg.obj(),
-                                          jports.obj());
+  Java_AwMessagePortService_onReceivedMessage(env,
+                                              jobj.obj(),
+                                              message_port_id,
+                                              jmsg.obj(),
+                                              jports.obj());
 }
 
 void AwMessagePortServiceImpl::OnMessagePortMessageFilterClosing(