Implement externally_connectable! Web pages can now communicate directly with

chrome/browser/extensions/api/messaging/message_service.h

Index: chrome/browser/extensions/api/messaging/message_service.h
diff --git a/chrome/browser/extensions/api/messaging/message_service.h b/chrome/browser/extensions/api/messaging/message_service.h
index 2236b82d7b2a6c3fc08d1e159ca3c8b473bf3549..f718afb6b0651e88d63eabaaca4751e9661e0353 100644
--- a/chrome/browser/extensions/api/messaging/message_service.h
+++ b/chrome/browser/extensions/api/messaging/message_service.h
@@ -212,6 +212,12 @@ class MessageService : public ProfileKeyedAPI,
       PostMessage(port_id, message.Pass());
   }
 
+  // Immediate dispatches a disconnect to |source| for |port_id|. Sets
+  // |error_message| for source if non-empty.

[Jeffrey Yasskin, 2013/06/08 02:27:47]

If the source is non-empty? What's it mean to set an error message? Is that
"sets runtime.lastError=|error_message|"?

[not at google - send to devlin, 2013/06/08 02:36:50]

Done.

+  void DispatchOnDisconnect(content::RenderProcessHost* source,
+                            int port_id,
+                            const std::string& reason);

[Jeffrey Yasskin, 2013/06/08 02:27:47]

Remember to rename this argument.

[not at google - send to devlin, 2013/06/08 02:36:50]

Done.

+
   // ProfileKeyedAPI implementation.
   static const char* service_name() {
     return "MessageService";