Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/api/tab_capture/tab_capture_registry.cc

 // 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.
 
 #include "chrome/browser/extensions/api/tab_capture/tab_capture_registry.h"
 
 #include "base/lazy_instance.h"
 #include "base/values.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
@@ skipping 295 matching lines @@
 void TabCaptureRegistry::DispatchStatusChangeEvent(
     const LiveRequest* request) const {
   EventRouter* router = EventRouter::Get(browser_context_);
   if (!router)
     return;
 
   scoped_ptr<base::ListValue> args(new base::ListValue());
   tab_capture::CaptureInfo info;
   request->GetCaptureInfo(&info);
   args->Append(info.ToValue().release());
-  scoped_ptr<Event> event(new Event(tab_capture::OnStatusChanged::kEventName,
-      args.Pass()));
+  scoped_ptr<Event> event(new Event(
+      events::UNKNOWN, tab_capture::OnStatusChanged::kEventName, args.Pass()));
   event->restrict_to_browser_context = browser_context_;
 
   router->DispatchEventToExtension(request->extension_id(), event.Pass());
 }
 
 TabCaptureRegistry::LiveRequest* TabCaptureRegistry::FindRequest(
     const content::WebContents* target_contents) const {
   for (ScopedVector<LiveRequest>::const_iterator it = requests_.begin();
        it != requests_.end(); ++it) {
     if ((*it)->web_contents() == target_contents)
@@ skipping 20 matching lines @@
        it != requests_.end(); ++it) {
     if ((*it) == request) {
       requests_.erase(it);
       return;
     }
   }
   NOTREACHED();
 }
 
 }  // namespace extensions