Implement receiving transferred ports from JS

content/public/browser/message_port_provider.h

Index: content/public/browser/message_port_provider.h
diff --git a/content/public/browser/message_port_provider.h b/content/public/browser/message_port_provider.h
index cd720d1c4b88f2ebee3f05d44601233ce6688ec5..96d7bbbabd18455b215c9da4e887210472fbd7a7 100644
--- a/content/public/browser/message_port_provider.h
+++ b/content/public/browser/message_port_provider.h
@@ -65,6 +65,12 @@ class CONTENT_EXPORT MessagePortProvider {
   // Cleanup the message ports that belong to the closing delegate.
   static void OnMessagePortDelegateClosing(MessagePortDelegate * delegate);
 
+  // Update message port information when the message port is transferred
+  // from a different process. The updated message ports will have their
+  // routing numbers equal to the message port numbers.
+  static void UpdateMessagePort(int message_port_id,
+                                MessagePortDelegate* delegate);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(MessagePortProvider);
 };