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

chrome/browser/extensions/api/enterprise_platform_keys_private/enterprise_platform_keys_private_api.cc

 // Copyright (c) 2013 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/extensions/api/enterprise_platform_keys_private/enterprise_platform_keys_private_api.h"
 
 #include <string>
 #include <utility>
 
 #include "base/base64.h"
@@ skipping 72 matching lines @@
 EPKPChallengeKeyBase::EPKPChallengeKeyBase()
     : cryptohome_client_(
           chromeos::DBusThreadManager::Get()->GetCryptohomeClient()),
       async_caller_(cryptohome::AsyncMethodCaller::GetInstance()),
       install_attributes_(g_browser_process->platform_part()
                               ->browser_policy_connector_chromeos()
                               ->GetInstallAttributes()) {
   std::unique_ptr<chromeos::attestation::ServerProxy> ca_client(
       new chromeos::attestation::AttestationCAClient());
   default_attestation_flow_.reset(new chromeos::attestation::AttestationFlow(
-      async_caller_, cryptohome_client_, std::move(ca_client)));
+      async_caller_, cryptohome_client_, std::move(ca_client),
+      base::TimeDelta::Max()));
   attestation_flow_ = default_attestation_flow_.get();
 }
 
 EPKPChallengeKeyBase::EPKPChallengeKeyBase(
     chromeos::CryptohomeClient* cryptohome_client,
     cryptohome::AsyncMethodCaller* async_caller,
     chromeos::attestation::AttestationFlow* attestation_flow,
     chromeos::InstallAttributes* install_attributes) :
     cryptohome_client_(cryptohome_client),
     async_caller_(async_caller),
@@ skipping 530 matching lines @@
     std::string encoded_response;
     base::Base64Encode(data, &encoded_response);
     Respond(ArgumentList(
         api_epkp::ChallengeUserKey::Results::Create(encoded_response)));
   } else {
     Respond(Error(data));
   }
 }
 
 }  // namespace extensions