Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/api/automation_internal/automation_util.cc

 // Copyright 2014 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/api/automation_internal/automation_util.h"
 
 #include <string>
 #include <utility>
 
 #include "base/values.h"
@@ skipping 96 matching lines @@
 
   for (size_t i = 0; i < node_data.child_ids.size(); ++i) {
     out_node_data->child_ids.push_back(node_data.child_ids[i]);
   }
 }
 
 void DispatchEventInternal(content::BrowserContext* context,
                            const std::string& event_name,
                            scoped_ptr<base::ListValue> args) {
   if (context && EventRouter::Get(context)) {
-    scoped_ptr<Event> event(new Event(event_name, args.Pass()));
+    scoped_ptr<Event> event(
+        new Event(events::UNKNOWN, event_name, args.Pass()));
     event->restrict_to_browser_context = context;
     EventRouter::Get(context)->BroadcastEvent(event.Pass());
   }
 }
 
 }  // namespace
 
 namespace automation_util {
 
 void DispatchAccessibilityEventsToAutomation(
@@ skipping 47 matching lines @@
   DispatchEventInternal(
       browser_context,
       api::automation_internal::OnAccessibilityTreeDestroyed::kEventName,
       api::automation_internal::OnAccessibilityTreeDestroyed::Create(tree_id));
   AXTreeIDRegistry::GetInstance()->RemoveAXTreeID(tree_id);
 }
 
 }  // namespace automation_util
 
 }  // namespace extensions