Display local signin error without browser and record the path of selected profile in user manager.

chrome/browser/ui/user_manager.h

Index: chrome/browser/ui/user_manager.h
diff --git a/chrome/browser/ui/user_manager.h b/chrome/browser/ui/user_manager.h
index e6d2d349beb89422174052ab254aecdb517016af..b7503fbe49919581a083918bac8bb36c36b35294 100644
--- a/chrome/browser/ui/user_manager.h
+++ b/chrome/browser/ui/user_manager.h
@@ -18,6 +18,21 @@ class FilePath;
 // Cross-platform methods for displaying the user manager.
 class UserManager {
  public:
+  // TODO(noms): Figure out if this size can be computed dynamically or adjusted
+  // for smaller screens.
+  static const int kWindowWidth = 800;

[sky, 2016/09/21 23:00:02]

constexpr on all these.

[zmin, 2016/09/21 23:49:55]

Will do.

+  static const int kWindowHeight = 600;
+
+  // Dimensions of the reauth dialog displaying the old-style signin flow with
+  // the username and password challenge on the same form.
+  static const int kPasswordCombinedReauthDialogHeight = 440;
+  static const int kPasswordCombinedReauthDialogWidth = 360;
+
+  // Dimensions of the reauth dialog displaying the password-separated signin
+  // flow.
+  static const int kReauthDialogHeight = 512;
+  static const int kReauthDialogWidth = 448;
+
   // Shows the User Manager or re-activates an existing one, focusing the
   // profile given by |profile_path_to_focus|; passing an empty base::FilePath
   // focuses no user pod. Based on the value of |tutorial_mode|, a tutorial
@@ -55,20 +70,20 @@ class UserManager {
   // Hides the reauth dialog if it is showing.
   static void HideReauthDialog();
 
-  // TODO(noms): Figure out if this size can be computed dynamically or adjusted
-  // for smaller screens.
-  static const int kWindowWidth = 800;
-  static const int kWindowHeight = 600;
+// TODO(zmin): Remove the condition for MACOSX once user_manager_mac.cc is
+// updated.
+#if !defined(OS_MACOSX)
+  // Shows a dialog where the user login his or her profile by the first time
+  // via user manager.
+  static void ShowSigninDialog(content::BrowserContext* browser_context,
+                               const base::FilePath& profile_path);
 
-  // Dimensions of the reauth dialog displaying the old-style signin flow with
-  // the username and password challenge on the same form.
-  static const int kPasswordCombinedReauthDialogHeight = 440;
-  static const int kPasswordCombinedReauthDialogWidth = 360;
+  // Display local sign in error message without browser.
+  static void DisplayErrorMessage();
 
-  // Dimensions of the reauth dialog displaying the password-separated signin
-  // flow.
-  static const int kReauthDialogHeight = 512;
-  static const int kReauthDialogWidth =  448;
+  // Get the path of profile that is being signed in.
+  static base::FilePath GetSigninProfilePath();
+#endif
 
   // Abstract base class for performing online reauthentication of profiles in
   // the User Manager. It is concretely implemented in UserManagerMac and