Add error log in case enrolled device lacks DM token.

chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.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/chromeos/policy/device_cloud_policy_store_chromeos.h"
 
 #include "base/bind.h"
+#include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/sequenced_task_runner.h"
 #include "chrome/browser/chromeos/policy/device_policy_decoder_chromeos.h"
 #include "chrome/browser/chromeos/policy/enterprise_install_attributes.h"
 #include "chrome/browser/chromeos/policy/proto/chrome_device_policy.pb.h"
 #include "policy/proto/device_management_backend.pb.h"
 
 namespace em = enterprise_management;
 
 namespace policy {
@@ skipping 122 matching lines @@
   const chromeos::DeviceSettingsService::Status status =
       device_settings_service_->status();
   if (!uma_done_ &&
       status != chromeos::DeviceSettingsService::STORE_TEMP_VALIDATION_ERROR) {
     uma_done_ = true;
     const bool has_dm_token =
         status == chromeos::DeviceSettingsService::STORE_SUCCESS &&
         device_settings_service_->policy_data() &&
         device_settings_service_->policy_data()->has_request_token();
     UMA_HISTOGRAM_BOOLEAN("Enterprise.EnrolledPolicyHasDMToken", has_dm_token);
+    LOG_IF(ERROR, !has_dm_token)
+        << "Policy read on enrolled device yields no DM token! "
+        << "Status: " << status << ".";
   }
 
   switch (device_settings_service_->status()) {
     case chromeos::DeviceSettingsService::STORE_SUCCESS: {
       status_ = STATUS_OK;
       policy_.reset(new em::PolicyData());
       if (device_settings_service_->policy_data())
         policy_->MergeFrom(*device_settings_service_->policy_data());
 
       PolicyMap new_policy_map;
@@ skipping 18 matching lines @@
     case chromeos::DeviceSettingsService::STORE_VALIDATION_ERROR:
     case chromeos::DeviceSettingsService::STORE_TEMP_VALIDATION_ERROR:
       status_ = STATUS_LOAD_ERROR;
       break;
   }
 
   NotifyStoreError();
 }
 
 }  // namespace policy