Show the serial number of the device in the version string if available.

BUG=216422
TEST=manual.

Review URL: https://codereview.chromium.org/613653004

Cr-Commit-Position: refs/heads/master@{#297160}

chrome/app/chromeos_strings.grdp

@@ -5032,7 +5032,7 @@ Battery full
     Remove this user
   </message>
   <message name="IDS_LOGIN_VERSION_LABEL_FORMAT" desc="Login screen version text format.">
-    <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> <ph name="PRODUCT_VERSION">$2<ex>15.0.0.0</ex></ph> (Platform <ph name="PLATFORM_VERSION">$3<ex>900.0-11.09.01</ex></ph>)
+    <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph> <ph name="PRODUCT_VERSION">$2<ex>15.0.0.0</ex></ph> (Platform <ph name="PLATFORM_VERSION">$3<ex>900.0-11.09.01</ex></ph>) <ph name="DEVICE_SERIAL_NUMBER">$4<ex>SN:123456789ABC</ex></ph>
   </message>
   <message name="IDS_DEVICE_OWNED_BY_NOTICE" desc="Text for notifications showing that this is managed device.">
     This device is managed by <ph name="DOMAIN">$1<ex>acmecorp.com</ex></ph>.

chrome/browser/chromeos/login/version_info_updater.cc

@@ -33,7 +33,10 @@ const char* kReportingFlags[] = {
   chromeos::kReportDeviceLocation,
 };
 
-}
+// Strings used to generate the serial number part of the version string.
+const char kSerialNumberPrefix[] = "SN:";
+
+}  // namespace
 
 ///////////////////////////////////////////////////////////////////////////////
 // VersionInfoUpdater public:
@@ -92,12 +95,15 @@ void VersionInfoUpdater::UpdateVersionLabel() {
   if (version_text_.empty())
     return;
 
+  UpdateSerialNumberInfo();
+
   chrome::VersionInfo version_info;
   std::string label_text = l10n_util::GetStringFUTF8(
       IDS_LOGIN_VERSION_LABEL_FORMAT,
       l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
       base::UTF8ToUTF16(version_info.Version()),
-      base::UTF8ToUTF16(version_text_));
+      base::UTF8ToUTF16(version_text_),
+      base::UTF8ToUTF16(serial_number_text_));
 
   // Workaround over incorrect width calculation in old fonts.
   // TODO(glotov): remove the following line when new fonts are used.
@@ -124,6 +130,14 @@ void VersionInfoUpdater::SetEnterpriseInfo(const std::string& domain_name) {
   }
 }
 
+void VersionInfoUpdater::UpdateSerialNumberInfo() {
+  std::string sn = policy::DeviceCloudPolicyManagerChromeOS::GetMachineID();
+  if (!sn.empty()) {
+    serial_number_text_ = kSerialNumberPrefix;
+    serial_number_text_.append(sn);
+  }
+}
+
 void VersionInfoUpdater::OnVersion(const std::string& version) {
   version_text_ = version;
   UpdateVersionLabel();

chrome/browser/chromeos/login/version_info_updater.h

@@ -59,6 +59,9 @@ class VersionInfoUpdater : public policy::CloudPolicyStore::Observer {
   // Set enterprise domain name.
   void SetEnterpriseInfo(const std::string& domain_name);
 
+  // Creates a serial number string.
+  void UpdateSerialNumberInfo();
+
   // Callback from chromeos::VersionLoader giving the version.
   void OnVersion(const std::string& version);
 
@@ -71,6 +74,7 @@ class VersionInfoUpdater : public policy::CloudPolicyStore::Observer {
 
   // Information pieces for version label.
   std::string version_text_;
+  std::string serial_number_text_;
 
   // Full text for the OS version label.
   std::string os_version_label_text_;