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

google_apis/gaia/google_service_auth_error.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.
 
 // A GoogleServiceAuthError is immutable, plain old data representing an
 // error from an attempt to authenticate with a Google service.
 // It could be from Google Accounts itself, or any service using Google
 // Accounts (e.g expired credentials).  It may contain additional data such as
 // captcha or OTP challenges.
 
@@ skipping 15 matching lines @@
 
 #include "url/gurl.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 class GoogleServiceAuthError {
  public:
   //
-  // These enumerations are referenced by integer value in HTML login code.
-  // Do not change the numeric values.
+  // These enumerations are referenced by integer value in HTML login code and
+  // in UMA histograms. Do not change the numeric values.
   //
   enum State {
     // The user is authenticated.
     NONE = 0,
 
     // The credentials supplied to GAIA were either invalid, or the locally
     // cached credentials have expired.
     INVALID_GAIA_CREDENTIALS = 1,
 
     // The GAIA user is not authorized to use the service.
@@ skipping 156 matching lines @@
                          int field_length);
 
   State state_;
   Captcha captcha_;
   SecondFactor second_factor_;
   int network_error_;
   std::string error_message_;
 };
 
 #endif  // GOOGLE_APIS_GAIA_GOOGLE_SERVICE_AUTH_ERROR_H_