Show Captcha dialog.

chrome/browser/chromeos/login/login_utils.h

Index: chrome/browser/chromeos/login/login_utils.h
diff --git a/chrome/browser/chromeos/login/login_utils.h b/chrome/browser/chromeos/login/login_utils.h
index 2637e3e366a5e7a489cb8fd3dcfbbe1e786b4dc6..306623ca2987b61dea38b3daaa9ce101e66c4f64 100644
--- a/chrome/browser/chromeos/login/login_utils.h
+++ b/chrome/browser/chromeos/login/login_utils.h
@@ -28,6 +28,13 @@ class LoginUtils {
   // Task posted to the UI thread.
   static void DoBrowserLaunch(Profile* profile);
 
+  // Extracts specified param from given ClientLogin response.
+  // Returns the param value if found, empty string otherwise.
+  // Ex. prefix: "Auth=", suffix: "\n"
+  static std::string ExtractClientLoginParam(const std::string& credentials,
+                                             const std::string& param_prefix,
+                                             const std::string& param_suffix);
+
   virtual ~LoginUtils() {}
 
   // Returns true if we are still waiting for wifi connection.