Enable new sign in flow for E2E tests.

chrome/browser/ui/webui/signin/login_ui_test_utils.h

Index: chrome/browser/ui/webui/signin/login_ui_test_utils.h
diff --git a/chrome/browser/ui/webui/signin/login_ui_test_utils.h b/chrome/browser/ui/webui/signin/login_ui_test_utils.h
index 3f17f46c0968dfd66e0cc518c27601962c595b11..bf9a11051041af161ad1597ee3b8be20de348c58 100644
--- a/chrome/browser/ui/webui/signin/login_ui_test_utils.h
+++ b/chrome/browser/ui/webui/signin/login_ui_test_utils.h
@@ -14,12 +14,31 @@ namespace login_ui_test_utils {
 // Blocks until the login UI is available and ready for authorization.
 void WaitUntilUIReady(Browser* browser);
 
+// Blocks until an element with id |element_id| exists in the signin page.
+void WaitUntilElementExistsInSigninFrame(Browser* browser,
+                                         const std::string& element_id);
+
+// Returns whether an element with id |element_id| exists in the signin page.
+bool ElementExistsInSigninFrame(Browser* browser,
+                                const std::string& element_id);
+
 // Executes JavaScript code to sign in a user with email and password to the
-// auth iframe hosted by gaia_auth extension.
+// auth iframe hosted by gaia_auth extension. This function automatically
+// detects the version of GAIA sign in page to use.
 void ExecuteJsToSigninInSigninFrame(Browser* browser,
                                     const std::string& email,
                                     const std::string& password);
 
+// Executes JS to sign in the user in the new GAIA sign in flow.
+void SigninInNewGaiaFlow(Browser* browser,
+                         const std::string& email,
+                         const std::string& password);
+
+// Executes JS to sign in the user in the old GAIA sign in flow.
+void SigninInOldGaiaFlow(Browser* browser,
+                         const std::string& email,
+                         const std::string& password);
+
 // A function to sign in a user using Chrome sign-in UI interface.
 // This will block until a signin succeeded or failed notification is observed.
 bool SignInWithUI(Browser* browser,