Add "Show saved copy" button in dino page when there's offline copy

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 d0665577a361c08097bf06bdf5132d78d456685f..3b299f4a5d071414dc9a909d56ff651bfe1b2495 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -8830,9 +8830,12 @@ I don't think this site should be blocked!
         </message>
       </if>
       <if expr="is_android">
-        <message name="IDS_ERRORPAGES_BUTTON_SHOW_SAVED_PAGES" desc="Label for the button on an error page to show pages that have been saved offline">
+        <message name="IDS_ERRORPAGES_BUTTON_SHOW_OFFLINE_PAGES" desc="Label for the button on an error page to show pages that have been saved offline">
           Show all saved pages
         </message>
+        <message name="IDS_ERRORPAGES_BUTTON_SHOW_OFFLINE_COPY" desc="Label for the button on an error page to show the copy of this page that has been saved offline">
+          Show saved copy
+        </message>
       </if>
       <message name="IDS_ERRORPAGE_FUN_DISABLED" desc="Explanation for when easter egg has been disabled by administrator">
         The owner of this device turned off the dinosaur game.