Return Windows error code when create-process fails.

chrome/installer/mini_installer/mini_installer_constants.cc

Index: chrome/installer/mini_installer/mini_installer_constants.cc
diff --git a/chrome/installer/mini_installer/mini_installer_constants.cc b/chrome/installer/mini_installer/mini_installer_constants.cc
index 65d1fd91a4e2f39460cdb125db67a7fd413e632a..f17d448d416cae525a13c623594ac3801b9b92d1 100644
--- a/chrome/installer/mini_installer/mini_installer_constants.cc
+++ b/chrome/installer/mini_installer/mini_installer_constants.cc
@@ -46,6 +46,10 @@ const wchar_t kApRegistryValue[] = L"ap";
 // The name of the value in kCleanupRegistryKey that tells the installer not to
 // delete extracted files.
 const wchar_t kCleanupRegistryValue[] = L"ChromeInstallerCleanup";
+// These values provide installer result codes to Omaha.
+const wchar_t kInstallerErrorRegistryValue[] = L"InstallerError";
+const wchar_t kInstallerExtraCode1RegistryValue[] = L"InstallerExtraCode1";
+const wchar_t kInstallerResultRegistryValue[] = L"InstallerResult";
 // The name of an app's Client State registry value that holds the path to its
 // uninstaller.
 const wchar_t kUninstallRegistryValue[] = L"UninstallString";