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

chrome/browser/ui/views/profiles/user_manager_view.h

Index: chrome/browser/ui/views/profiles/user_manager_view.h
diff --git a/chrome/browser/ui/views/profiles/user_manager_view.h b/chrome/browser/ui/views/profiles/user_manager_view.h
index 8de45f806d8665055199dc5dc3866e9cf6aeb670..3b02567385477365207d1c7ea9168d0c5e3ba35a 100644
--- a/chrome/browser/ui/views/profiles/user_manager_view.h
+++ b/chrome/browser/ui/views/profiles/user_manager_view.h
@@ -31,6 +31,9 @@ class ReauthDelegate : public views::DialogDelegateView,
   // UserManager::BaseReauthDialogDelegate:
   void CloseReauthDialog() override;
 
+  // Display the local error message inside login window.
+  void DisplayErrorMessage();
+
  private:
   ReauthDelegate();
 
@@ -50,7 +53,7 @@ class ReauthDelegate : public views::DialogDelegateView,
   int GetDialogButtons() const override;
   views::View* GetInitiallyFocusedView() override;
 
-  UserManagerView* parent_; // Not owned.
+  UserManagerView* parent_;  // Not owned.
   views::WebView* web_view_;
   const std::string email_address_;
 
@@ -97,6 +100,12 @@ class UserManagerView : public views::DialogDelegateView {
   // Hides the reauth dialog if it is showing.
   void HideReauthDialog();
 
+  // Display sign in error message without browser.

[anthonyvd, 2016/09/22 18:38:45]

Can you expand a bit on what that comment means? It's pretty obvious now but it
might not be for an outsider reading it in a few months.

[zmin, 2016/09/22 19:14:56]

Done.

+  void DisplayErrorMessage();
+
+  void SetSigninProfilePath(const base::FilePath& profile_path);

[anthonyvd, 2016/09/22 18:38:45]

Can you please document what those do with a comment?

[zmin, 2016/09/22 19:14:56]

Done.

+  base::FilePath GetSigninProfilePath();
+
  private:
   friend class ReauthDelegate;
   friend std::default_delete<UserManagerView>;
@@ -129,6 +138,8 @@ class UserManagerView : public views::DialogDelegateView {
   std::unique_ptr<ScopedKeepAlive> keep_alive_;
   base::Time user_manager_started_showing_;
 
+  base::FilePath signin_profile_path_;
+
   DISALLOW_COPY_AND_ASSIGN(UserManagerView);
 };