Implements extensions devtools API

chrome/browser/extensions/extension_message_service.h

Index: chrome/browser/extensions/extension_message_service.h
diff --git a/chrome/browser/extensions/extension_message_service.h b/chrome/browser/extensions/extension_message_service.h
index a6b1cd5a90761128045161121649204a724b71f9..32ed945b0071b4f33822f8f12a4cf7cb11410a09 100644
--- a/chrome/browser/extensions/extension_message_service.h
+++ b/chrome/browser/extensions/extension_message_service.h
@@ -13,6 +13,7 @@
 #include "base/lock.h"
 #include "base/ref_counted.h"
 #include "chrome/common/notification_registrar.h"
+#include "chrome/browser/extensions/extension_devtools_manager.h"
 #include "ipc/ipc_message.h"
 
 class MessageLoop;
@@ -157,6 +158,8 @@ class ExtensionMessageService
 
   MessageChannelMap channels_;
 
+  scoped_refptr<ExtensionDevToolsManager> extension_devtools_manager_;
+
   // A map between an event name and a set of process id's that are listening
   // to that event.
   typedef std::map<std::string, std::set<int> > ListenerMap;