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

chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h

Index: chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h
diff --git a/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h b/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h
index b5c6623d16a1012d32d900ee02ef1f31da855dbe..867488a2bb2f11f7bc671ae32904bfe7f50910f2 100644
--- a/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h
+++ b/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h
@@ -11,6 +11,7 @@
 #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"
@@ -134,6 +135,12 @@ class UserCloudPolicyManagerChromeOS
   // 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);
 };