Adding Sign-in promo for bookmark view.

ios/chrome/app/strings/ios_google_chrome_strings.grd

Index: ios/chrome/app/strings/ios_google_chrome_strings.grd
diff --git a/ios/chrome/app/strings/ios_google_chrome_strings.grd b/ios/chrome/app/strings/ios_google_chrome_strings.grd
index d16708fbd95cadc088eb2245fd9e27dbd5156bef..0304330ae1982d2083d9d2e3396d3ac38d5c6cf6 100644
--- a/ios/chrome/app/strings/ios_google_chrome_strings.grd
+++ b/ios/chrome/app/strings/ios_google_chrome_strings.grd
@@ -288,6 +288,9 @@ locale.  The strings in this file are specific to iOS.
       <message name="IDS_IOS_SIGNIN_PROMO_RECENT_TABS" desc="Text to inform the user that they can sign in to get the recent tabs from other computers">
         To get your tabs on all your devices, sign in to Chrome.
       </message>
+      <message name="IDS_IOS_SIGNIN_PROMO_BOOKMARKS" desc="Text to inform the user that they can sign in to get bookmarks shared between devices">
+        To get your bookmarks on all your devices, sign in to Chrome.
+      </message>
     </messages>
   </release>
 </grit>