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..b26dc21a47a59783a1d9e61187eaac1137ba56f7 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;
@@ -59,6 +64,10 @@ namespace ui {
 class WebDialogDelegate;
 }
 
+namespace views {
+class Widget;
+}
+
 namespace chrome {
 
 // Shows or hides the Task Manager. |browser| can be NULL when called from Ash.
@@ -159,6 +168,19 @@ void ShowWebShareTargetPickerDialog(gfx::NativeWindow parent_window,
 
 #endif  // TOOLKIT_VIEWS
 
+#if defined(TOOLKIT_VIEWS) && !defined(OS_MACOSX)
+
+// Show the ForcedReauthenticationDialog for |profile|. If there're no opened
+// browser windows for |profile|, |signin_manager| will be called to signed out
+// immediately. Otherwise, dialog will be closed with all browser windows are
+// assoicated to |profile| after |countdown_duration| if there is no reauth.
+views::Widget* ShowForcedReauthenticationDialog(

[sky, 2017/06/22 14:52:02]

Remember, no platform specific ui code here.
Also, please merge with with the ifdef two lines above.

[zmin, 2017/06/23 00:58:40]

And I have moved the new class/function Declarations to its own file.

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