Wait for the attestation to be ready (TPM being prepared for attestation) before trying to enroll.

chrome/browser/chromeos/policy/browser_policy_connector_chromeos.cc

 // Copyright 2014 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/browser_policy_connector_chromeos.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 346 matching lines @@
           cryptohome::AsyncMethodCaller::GetInstance(), CreateAttestationFlow(),
           chromeos::system::StatisticsProvider::GetInstance());
   device_cloud_policy_initializer_->Init();
 }
 
 std::unique_ptr<chromeos::attestation::AttestationFlow>
 BrowserPolicyConnectorChromeOS::CreateAttestationFlow() {
   return base::MakeUnique<chromeos::attestation::AttestationFlow>(
       cryptohome::AsyncMethodCaller::GetInstance(),
       chromeos::DBusThreadManager::Get()->GetCryptohomeClient(),
-      base::MakeUnique<chromeos::attestation::AttestationCAClient>());
+      base::MakeUnique<chromeos::attestation::AttestationCAClient>(),
+      base::TimeDelta::FromMinutes(1));
 }
 
 chromeos::AffiliationIDSet
 BrowserPolicyConnectorChromeOS::GetDeviceAffiliationIDs() const {
   chromeos::AffiliationIDSet affiliation_ids;
   if (device_cloud_policy_manager_) {
     const enterprise_management::PolicyData* const policy_data =
         device_cloud_policy_manager_->device_store()->policy();
     if (policy_data) {
       affiliation_ids.insert(policy_data->device_affiliation_ids().begin(),
                              policy_data->device_affiliation_ids().end());
     }
   }
   return affiliation_ids;
 }
 
 }  // namespace policy