Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/api/identity/identity_api.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/identity/identity_api.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 214 matching lines @@
 void IdentityAPI::OnAccountRemoved(const gaia::AccountIds& ids) {
 }
 
 void IdentityAPI::OnAccountSignInChanged(const gaia::AccountIds& ids,
                                          bool is_signed_in) {
   api::identity::AccountInfo account_info;
   account_info.id = ids.gaia;
 
   scoped_ptr<base::ListValue> args =
       api::identity::OnSignInChanged::Create(account_info, is_signed_in);
-  scoped_ptr<Event> event(new Event(api::identity::OnSignInChanged::kEventName,
-                                    args.Pass(),
-                                    browser_context_));
+  scoped_ptr<Event> event(new Event(events::UNKNOWN,
+                                    api::identity::OnSignInChanged::kEventName,
+                                    args.Pass(), browser_context_));
 
   EventRouter::Get(browser_context_)->BroadcastEvent(event.Pass());
 }
 
 void IdentityAPI::AddShutdownObserver(ShutdownObserver* observer) {
   shutdown_observer_list_.AddObserver(observer);
 }
 
 void IdentityAPI::RemoveShutdownObserver(ShutdownObserver* observer) {
   shutdown_observer_list_.RemoveObserver(observer);
@@ skipping 721 matching lines @@
   if (redirect_url.GetWithEmptyPath() == final_url_prefix_) {
     SetResult(new base::StringValue(redirect_url.spec()));
     SendResponse(true);
     if (auth_flow_)
       auth_flow_.release()->DetachDelegateAndDelete();
     Release();  // Balanced in RunAsync.
   }
 }
 
 }  // namespace extensions