Device robot refresh token integrity validation.

chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.cc

Index: chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.cc
diff --git a/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.cc b/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.cc
index ade9de8967c7f7879a023148e1d05d29fa757beb..e12200fe0ad51d5fe22cc0b77c78ff12d66ee663 100644
--- a/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.cc
+++ b/chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.cc
@@ -223,6 +223,11 @@ std::string DeviceCloudPolicyManagerChromeOS::GetMachineModel() {
   return GetMachineStatistic(kMachineInfoSystemHwqual);
 }
 
+std::string DeviceCloudPolicyManagerChromeOS::GetRobotAccountId() {
+  const enterprise_management::PolicyData* policy = device_store_->policy();
+  return policy ? policy->service_account_identity() : std::string();
+}
+
 scoped_ptr<CloudPolicyClient> DeviceCloudPolicyManagerChromeOS::CreateClient() {
   return make_scoped_ptr(
       new CloudPolicyClient(GetMachineID(), GetMachineModel(),