Add UMA stats for initial user policy fetch on Chrome OS.

chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_POLICY_USER_CLOUD_POLICY_MANAGER_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_USER_CLOUD_POLICY_MANAGER_CHROMEOS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/time/time.h"
 #include "chrome/browser/policy/cloud/cloud_policy_client.h"
 #include "chrome/browser/policy/cloud/cloud_policy_constants.h"
 #include "chrome/browser/policy/cloud/cloud_policy_manager.h"
 #include "chrome/browser/policy/cloud/cloud_policy_service.h"
 #include "chrome/browser/policy/cloud/component_cloud_policy_service.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 
 class GoogleServiceAuthError;
 class PrefService;
 
@@ skipping 103 matching lines @@
   PrefService* local_state_;
 
   // Used to fetch the policy OAuth token, when necessary. This object holds
   // a callback with an unretained reference to the manager, when it exists.
   scoped_ptr<PolicyOAuth2TokenFetcher> token_fetcher_;
 
   // The access token passed to OnAccessTokenAvailable. It is stored here so
   // that it can be used if OnInitializationCompleted is called later.
   std::string access_token_;
 
+  // Timestamps for collecting timing UMA stats.
+  base::Time time_init_started_;
+  base::Time time_init_completed_;
+  base::Time time_token_available_;
+  base::Time time_client_registered_;
+
   DISALLOW_COPY_AND_ASSIGN(UserCloudPolicyManagerChromeOS);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_USER_CLOUD_POLICY_MANAGER_CHROMEOS_H_