Make sure ShellIntegration::CommandLineArgsForLauncher respects the UserDataDir policy.

chrome/browser/policy/policy_path_parser.h

Index: chrome/browser/policy/policy_path_parser.h
diff --git a/chrome/browser/policy/policy_path_parser.h b/chrome/browser/policy/policy_path_parser.h
index ce940c33830fca37fd763259fde5679dc27998ba..5afc09985a3d85ff9b95490d99ca755645855664 100644
--- a/chrome/browser/policy/policy_path_parser.h
+++ b/chrome/browser/policy/policy_path_parser.h
@@ -49,6 +49,17 @@ namespace path_parser {
 base::FilePath::StringType ExpandPathVariables(
     const base::FilePath::StringType& untranslated_string);
 
+// A helper function used to read the UserDataDir path policy without relying on
+// any policy infrastructure. This is required because this policy is needed
+// much earlier before the PrefService is initialized.
+// The function will fill |user_data_dir| if the policy "UserDataDir" is set and
+// leave it intact if the policy is missing. If the policy is set it should
+// override any manual changes to the profile path the user might have made so
+// this function should be used to verify no policy is specified whenever the
+// profile path is not read from the PathService which already takes this into
+// account.
+void CheckUserDataDirPolicy(base::FilePath* user_data_dir);
+
 }  // namespace path_parser
 
 }  // namespace policy