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..3f57d0849cbc5ec480a0e65761be4c626c3408d0 100644
--- a/chrome/browser/previews/previews_infobar_delegate.h
+++ b/chrome/browser/previews/previews_infobar_delegate.h
@@ -51,6 +51,12 @@ 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,
@@ -58,14 +64,19 @@ class PreviewsInfoBarDelegate : public ConfirmInfoBarDelegate {
       bool is_data_saver_user,
       const OnDismissPreviewsInfobarCallback& on_dismiss_callback);
 
+#if defined(OS_ANDROID)
+  // Returns a Previews infobar that owns |delegate|.
+  static std::unique_ptr<infobars::InfoBar> CreateInfoBar(

[RyanSturm, 2017/05/08 20:48:17]

Why is this declared here and defined in 
chrome/browser/ui/android/infobars/previews_infobar.cc?

[megjablon, 2017/05/08 22:49:19]

This is the pattern used by infobars and infobar delegates. dfalcantara@ can you
comment on why? I moved this to PreviewsInfobar now.

+      infobars::InfoBarManager* infobar_manager,
+      std::unique_ptr<PreviewsInfoBarDelegate> delegate);
+#endif
+
   // ConfirmInfoBarDelegate overrides:
   infobars::InfoBarDelegate::InfoBarIdentifier GetIdentifier() const override;
   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_;