Implement externally_connectable! Web pages can now communicate directly with

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_MESSAGING_MESSAGE_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_MESSAGING_MESSAGE_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 194 matching lines @@
     if (host)
       CloseChannel(port_id, error_message);
   }
   void PendingPostMessage(int port_id,
                           scoped_ptr<base::ListValue> message,
                           extensions::ExtensionHost* host) {
     if (host)
       PostMessage(port_id, message.Pass());
   }
 
+  // Immediate dispatches a disconnect to |source| for |port_id| given |reason|.

[Jeffrey Yasskin, 2013/06/08 00:28:09]

Is "reason" a human-readable string or something else? What does extension_id
mean about the behavior?

[not at google - send to devlin, 2013/06/08 02:02:33]

Done.

+  void DispatchOnDisconnect(content::RenderProcessHost* source,
+                            int port_id,
+                            const std::string& extension_id,
+                            const std::string& reason);
+  void DispatchOnDisconnect(content::RenderProcessHost* source,
+                            int port_id,
+                            const std::string& reason) {
+    DispatchOnDisconnect(source, port_id, std::string(), reason);
+  }
+
   // ProfileKeyedAPI implementation.
   static const char* service_name() {
     return "MessageService";
   }
   static const bool kServiceRedirectedInIncognito = true;
   static const bool kServiceIsCreatedWithBrowserContext = false;
   static const bool kServiceIsNULLWhileTesting = true;
 
   content::NotificationRegistrar registrar_;
   MessageChannelMap channels_;
   PendingChannelMap pending_channels_;
 
   // Weak pointer. Guaranteed to outlive this class.
   LazyBackgroundTaskQueue* lazy_background_task_queue_;
 
   base::WeakPtrFactory<MessageService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageService);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_MESSAGING_MESSAGE_SERVICE_H_