Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/api/webrtc_audio_private/webrtc_audio_private_api.cc

 // Copyright 2013 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/webrtc_audio_private/webrtc_audio_private_api.h"
 
 #include "base/lazy_instance.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/task_runner_util.h"
 #include "chrome/browser/extensions/api/tabs/tabs_constants.h"
@@ skipping 74 matching lines @@
   EventRouter* router = EventRouter::Get(browser_context_);
   if (!router || !router->HasEventListener(kEventName))
     return;
 
   for (const scoped_refptr<const extensions::Extension>& extension :
        ExtensionRegistry::Get(browser_context_)->enabled_extensions()) {
     const std::string& extension_id = extension->id();
     if (router->ExtensionHasEventListener(extension_id, kEventName) &&
         extension->permissions_data()->HasAPIPermission("webrtcAudioPrivate")) {
       scoped_ptr<Event> event(
-          new Event(kEventName, make_scoped_ptr(new base::ListValue()).Pass()));
+          new Event(events::UNKNOWN, kEventName,
+                    make_scoped_ptr(new base::ListValue()).Pass()));
       router->DispatchEventToExtension(extension_id, event.Pass());
     }
   }
 }
 
 WebrtcAudioPrivateFunction::WebrtcAudioPrivateFunction()
     : resource_context_(NULL) {
 }
 
 WebrtcAudioPrivateFunction::~WebrtcAudioPrivateFunction() {
@@ skipping 397 matching lines @@
     results_.reset(wap::GetAssociatedSink::Results::Create("").release());
   } else {
     results_.reset(
         wap::GetAssociatedSink::Results::Create(associated_sink_id).release());
   }
 
   SendResponse(true);
 }
 
 }  // namespace extensions