After signin token check failed, show force reauth dialog and start window closing countdown.

chrome/browser/ui/browser_dialogs.h

Index: chrome/browser/ui/browser_dialogs.h
diff --git a/chrome/browser/ui/browser_dialogs.h b/chrome/browser/ui/browser_dialogs.h
index 98ead916e7225cec73feea1f967eb3e55bf31d78..e19873385824ea28110730a11fe4e4254bae35f1 100644
--- a/chrome/browser/ui/browser_dialogs.h
+++ b/chrome/browser/ui/browser_dialogs.h
@@ -24,9 +24,14 @@
 class Browser;
 class LoginHandler;
 class Profile;
+class SigninManager;
 class WebShareTarget;
 struct WebApplicationInfo;
 
+namespace base {
+class TimeDelta;
+}
+
 namespace content {
 class BrowserContext;
 class ColorChooser;
@@ -159,6 +164,17 @@ void ShowWebShareTargetPickerDialog(gfx::NativeWindow parent_window,
 
 #endif  // TOOLKIT_VIEWS
 
+#if defined(TOOLKIT_VIEWS) && !defined(OS_MACOSX)
+
+// Show/Hide the ForcedReauthenticationDialog for |profile|.

[sky, 2017/06/22 03:28:14]

Please document *all* paremeters. 

[zmin, 2017/06/22 07:34:58]

Done.

+void ShowForcedReauthenticationDialog(

[sky, 2017/06/22 03:28:14]

Can this return an object that is used to delete/close the dialog rather than
having to maintain a map?

[zmin, 2017/06/22 07:34:58]

Done.

+    Profile* profile,
+    SigninManager* signin_manager,
+    const base::TimeDelta& countdown_duration);

[sky, 2017/06/22 03:28:14]

We typically don't use a const ref for TimeDelta, but pass by value.

[zmin, 2017/06/22 07:34:57]

Done.

+void HideForcedReauthenticationDialog(Profile* profile);
+
+#endif  // TOOLKIT_VIEWS && !OS_MACOSX
+
 // Values used in the Dialog.Creation UMA metric. Each value represents a
 // different type of dialog box.
 // These values are written to logs. New enum values can be added, but existing