Add 'Updated just now' timestamp to the Previews infobar

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 809113109e2c05eb8db3079a8a033b5d44960808..2c85c1378a14a42df7b876c9fcecd2b7c8e30173 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -4983,6 +4983,9 @@ Keep your key file in a safe place. You will need it to create new versions of y
       </message>
       <message name="IDS_PREVIEWS_INFOBAR_TIMESTAMP_HOURS" desc="The desciption stating how old a preview version of a page is in hours. This is shown on the infobar notifying the user that a preview page has been shown.">
          Updated <ph name="HOURS">$1<ex>4</ex></ph>hrs ago
+      </message>      
+      <message name="IDS_PREVIEWS_INFOBAR_TIMESTAMP_UPDATED_NOW" desc="The desciption stating that a preview version of a page was just updated. This is shown on the infobar notifying the user that a preview page has been shown.">
+         Updated just now
       </message>
 
       <!-- WebRTC logs -->