Previews infobar tests

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 8e919d535cb32eee297abf562383d70a8700a2cc..1b133ef44a5cfa9851d8faddb6dc88ee2e30f5c0 100644
--- a/chrome/browser/previews/previews_infobar_delegate.h
+++ b/chrome/browser/previews/previews_infobar_delegate.h
@@ -25,6 +25,16 @@ class PreviewsInfoBarDelegate : public ConfirmInfoBarDelegate {
     OFFLINE,   // Offline copy of the page.
   };
 
+  // Actions on the previews infobar. This enum must remain synchronized with
+  // the enum of the same name in metrics/histograms/histograms.xml.
+  enum PreviewsInfoBarAction {
+    INFOBAR_SHOWN = 0,
+    INFOBAR_LOAD_ORIGINAL_CLICKED = 1,
+    INFOBAR_DISMISSED_BY_USER = 2,
+    INFOBAR_DISMISSED_BY_NAVIGATION = 3,
+    INFOBAR_INDEX_BOUNDARY
+  };
+
   ~PreviewsInfoBarDelegate() override;
 
   // Creates a preview infobar and corresponding delegate and adds the infobar