Add timestamp support to the Previews infobar

chrome/browser/previews/previews_infobar_delegate.h

Index: chrome/browser/previews/previews_infobar_delegate.h
diff --git a/chrome/browser/previews/previews_infobar_delegate.h b/chrome/browser/previews/previews_infobar_delegate.h
index f362be5c2a58d71a574dda0d2228860e1cc085b7..f43383433fbf9747e3568ecfb36d28614edb53f7 100644
--- a/chrome/browser/previews/previews_infobar_delegate.h
+++ b/chrome/browser/previews/previews_infobar_delegate.h
@@ -43,6 +43,8 @@ class PreviewsInfoBarDelegate : public ConfirmInfoBarDelegate {
 
   ~PreviewsInfoBarDelegate() override;
 
+  PreviewsInfoBarDelegate* AsPreviewsInfoBarDelegate() override;
+
   // Creates a preview infobar and corresponding delegate and adds the infobar
   // to InfoBarService.
   static void Create(
@@ -51,6 +53,12 @@ class PreviewsInfoBarDelegate : public ConfirmInfoBarDelegate {
       bool is_data_saver_user,
       const OnDismissPreviewsInfobarCallback& on_dismiss_callback);
 
+  // ConfirmInfoBarDelegate overrides:
+  base::string16 GetMessageText() const override;
+  base::string16 GetLinkText() const override;
+
+  base::string16 GetTimestampText() const;
+
  private:
   PreviewsInfoBarDelegate(
       content::WebContents* web_contents,
@@ -63,9 +71,7 @@ class PreviewsInfoBarDelegate : public ConfirmInfoBarDelegate {
   int GetIconId() const override;
   bool ShouldExpire(const NavigationDetails& details) const override;
   void InfoBarDismissed() override;
-  base::string16 GetMessageText() const override;
   int GetButtons() const override;
-  base::string16 GetLinkText() const override;
   bool LinkClicked(WindowOpenDisposition disposition) override;
 
   PreviewsInfoBarType infobar_type_;