Take 2 at browser_sync::ExtensionsActivityMonitor....

chrome/browser/extensions/extension_bookmarks_module.cc

 // Copyright (c) 2009 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.
 
 #include "chrome/browser/extensions/extension_bookmarks_module.h"
 
 #include "base/json/json_writer.h"
 #include "base/string_util.h"
 #include "chrome/browser/bookmarks/bookmark_codec.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
@@ skipping 96 matching lines @@
     // Bookmarks are not ready yet.  We'll wait.
     registrar_.Add(this, NotificationType::BOOKMARK_MODEL_LOADED,
                    NotificationService::AllSources());
     AddRef();  // Balanced in Observe().
     return;
   }
 
   ExtensionBookmarkEventRouter* event_router =
       ExtensionBookmarkEventRouter::GetSingleton();
   event_router->Observe(model);
-  SendResponse(RunImpl());
+  bool success = RunImpl();
+  if (success) {
+    NotificationService::current()->Notify(
+        NotificationType::EXTENSION_BOOKMARKS_API_INVOKED,
+        Source<const Extension>(GetExtension()),
+        Details<const BookmarksFunction>(this));
+  }
+  SendResponse(success);
 }
 
 bool BookmarksFunction::GetBookmarkIdAsInt64(
     const std::string& id_string, int64* id) {
   if (StringToInt64(id_string, id))
     return true;
 
   error_ = keys::kInvalidIdError;
   return false;
 }
@@ skipping 415 matching lines @@
     error_ = keys::kModifySpecialError;
     return false;
   }
   model->SetTitle(node, title);
 
   DictionaryValue* ret = ExtensionBookmarks::GetNodeDictionary(node, false);
   result_.reset(ret);
 
   return true;
 }