Add butter bar to login screen to show device enrollement info.

chrome/browser/chromeos/login/version_info_updater.cc

Index: chrome/browser/chromeos/login/version_info_updater.cc
diff --git a/chrome/browser/chromeos/login/version_info_updater.cc b/chrome/browser/chromeos/login/version_info_updater.cc
index ab891a913492bada870d3dc5f20056173eed7a45..9a2fbdade77cbc2949e09d404dd620d499de74b1 100644
--- a/chrome/browser/chromeos/login/version_info_updater.cc
+++ b/chrome/browser/chromeos/login/version_info_updater.cc
@@ -167,6 +167,19 @@ void VersionInfoUpdater::SetEnterpriseInfo(const std::string& domain_name,
     enterprise_domain_text_ = domain_name;
     enterprise_status_text_ = status_text;
     UpdateVersionLabel();
+
+    // Update the notification about device status reporting.
+    if (delegate_) {
+      std::string enterprise_info;
+      // When there is no managed domain, send an empty enterprise info
+      // message, which indicates that the message should not be shown.

[Nikita (slow), 2012/02/23 14:58:51]

We could as well not call OnEnterpriseInfoUpdated() in that case as domain is
not updated ("" > ""). Another transition is not possible ("domain" > "").
But I'm not insisting and this could could stay as is.

[Patrick Dubroy, 2012/02/28 00:51:02]

Done.

+      if (!domain_name.empty()) {
+        enterprise_info = l10n_util::GetStringFUTF8(
+            IDS_LOGIN_MANAGED_BY_NOTICE,
+            UTF8ToUTF16(enterprise_domain_text_));
+      }
+      delegate_->OnEnterpriseInfoUpdated(enterprise_info);
+    }
   }
 }